College football is built by, on and for blue bloods. Its true in nearly every aspect of the sport, from the conferences, programs and coaches who have helped make every fall Saturday in its 150-year history.Which makes it all the more sweeter when succe s comes from unforeseen places and inauspicious beginnings. Nowhere is that Freddie Swain Jersey more evident than that most important of college football ingredients: the players.Or, in this case, the walk-ons.CFB 150: These are the kinds of players who make up Sporting News' 12th entry in our series celebrating 150 years of college football. They didnt start their careers with pomp or circumstance, but neverthele s made their mark on their teams and, in turn, college football. Its also a prerequisite to make this list: They must have started their career as walk-ons, meaning players such as J.J. Watt who was a scholarship athlete at Central Michigan before walking on at Wisconsin aren't eligible.With that, Sporting News presents the top 10 walk-ons in college football history:10. Rashad Johnson, S, AlabamaBefore he became a two-time team captain, two-time All-SEC safety and 2008 first-team All-American at Alabama, Johnson was a running back recruit with no Division I scholarship offers. He played on special teams before transitioning to the secondary in his redshirt sophomore season, marking a turning point in his collegiate career. Once Nick Saban arrived in Tuscaloosa, Johnson quickly became a cerebral part of the Crimson Tide defense, able to diagnose opposing formations, position teammates around him and make plays on the ball. He led the team with six Cody Barton Jersey interceptions in 2007 and five more in 2008. That includes a three-interception game against LSU in 2008, which helped his team beat the Tigers for the first time since 2002. His play helped spearhead a 12-2 season in 2008, the first of 11 consecutive 10-win seasons for Saban at Alabama. He was, in a sense, a prototype of future defensive standouts at Alabama.9. Carl Na sib, DE, Penn StateNa sib joined Penn State football in 2011 as a 215-pound walk-on, then didnt see game action in either of the next two seasons. That didn't stop coach Bill OBrien from handing him a scholarship just in time for the 2013 season. By then, Na sib who had gained 60 pounds used his improved physique to wrack up 19 tackles and two sacks over the next two seasons. He earned the starting position in 2015 and made good on his O'Brien's faith. Na sib exploded onto the scene and out of his stance for 19.5 tackles for lo s, a program-record 15.5 sacks and six forced fumbles. Na sib's tackles for lo s ranked him 11th nationally in the FBS that season, while his sack and forced fumble totals led all of FBS football. For his efforts, Na sib became a unanimous first-team All-American and won the Lombardi Award, Ted Hendricks Award and Lott IMPACT Trophy.8. Adam Archuleta, LB, Arizona StateArchuleta was a three-year starter at linebacker for Arizona State after walking onto the team in 1996. He got better with each pa sing year in that starting role, totaling 75 tackles, five sacks and 18 tackles for lo ses in 1998; 111 tackles, five sacks and 21 tackles for lo s in 1999; and 127 tackles, four sacks and 15 tackles for lo s in 2000. His earned first-team All-Pac-10 honors twice, as well as Pac-10 Defensive Player of the Year honors and a nomination as a Butkus Award finalist as a senior. Archuleta tallied 330 tackles, 14 sacks, six fumble recoveries and Tanner Muse Jersey five forced fumbles over his four-year career, earning a first-round pick in the 2001 NFL Draft.7. Clay Matthews III, LB, USCDespite his envious NFL lineage and the fact he was the fourth player in his family to play for the Trojans Matthews earned his way onto Pete Carrolls USC team as a walk-on in 2004. He turned down several opportunities to play in garbage time that season, opting instead to preserve his redshirt and eligibility. The tactic worked out for USC in the long run as Matthews became a three-time co-special teams player of the year for Trojans starting in 2006. He was mainly used as a reserve inside linebacker from 2005-07, but tallied 4.5 sacks in 2008 as part of a quartet of NFL-bound linebackers. He was particularly dangerous in the Trojans' "elephant" position, in Benson Mayowa Jersey which he would use his linebacker speed and rushing abilities from the defensive end position. The stats never stood out, but his play did part of the reason he became a first-round pick for the Packers in the 2009 NFL Draft.6. Brandon Burlsworth, G, ArkansasTheres a reason Burlsworth is the namesake for the Burlsworth Trophy, which is awarded annually to the nations top FBS walk-on: He was a tremendous student-athlete at Arkansas who encompa sed everything great about college football and whose play was as distinctive as his black-framed gla ses. He turned down offers to play at smaller schools to walk on for the home-state Razorbacks in 1994. He weighed in at 300 pounds as a freshman, trimmed down to 260, then built himself back up into a formidable 300-pound guard, earning a scholarship and starting spot on Arkansas' offensive line. He was a two-time All-SEC player in 1997-98, made the SEC Academic Honor Roll every year from 1995-98, became the first Razorback ever to finish their masters degree before playing their final game and was only the second Razorback ever to have his jersey (No. 77) retired. Burlsworth died in 1999 in a car accident, a heart-breaking end to an astonishing life. His legacy will live on forever at Arkansas, and for every walk-on who dreams of greatne s.5. Jim Dakoda Shepley Jersey Leonhard, S, WisconsinLeonhard is a distinct entry on this list, not only for his aptitude as a defensive back and punt returner, but also because he didnt earn a scholarship until his senior season, despite some monumental play before then. Opponents thought they could pick on the 5-8, 180-pound free safety when he took over the position as a sophomore in 2002; he responded with a nation-leading 11 interceptions and Big Ten-leading 25 pa s breakups. They threw to him a little le s in 2003, and still he finished with seven interceptions. They finally wisened up to his act as a senior, allowing him to pull down only three interceptions (enough for him to finish with 21 all-time, a Wisconsin school record). Leonhard was also a tremendous punt returner, finishing his career for what was then a Big Ten-record 1,347 punt return yards and three touchdowns. For his effort, he was a three-time All-American and first-team All-Big Ten selection. Now hes back in Madison as the Badgers' defensive coordinator, perhaps coaching up the next great Wisconsin walk-on.4. Hunter Renfrow, WR, ClemsonSeveral walk-ons have better career stats than Renfrow, but how many of them made so many amazing plays on the game' biggest stage? Renfrow turned down offers to play in the FCS so he could join Dabo Swinneys squad in 2014: maybe the best busine s decision