For Texas Tech, some notable recent players are:
LB Zach Thomas
WR Wes Welker
WR Michael Crabtree
QB Patrick Mahomes
QB Graham Harrell
QB and later head coach Kliff Kingsbury
Mahomes was a nice college QB, but obviously made more of an impact as a pro. I think for college impact, Crabtree takes the cake from this group. 2-time All American and had that memorable TD against Texas at the last second in 2008 I believe.
Besides Crabtree (07, 08), here are their other 2-time All Americans:
Zach Thomas (94, 95)
RB Donny Anderson (64, 65)
CB/LB EJ Houlb (59, 60)