A gent on YouTube whose very appropriate name is "DoubleBassScore" has exactly that - images of scores and the accompanying audio played by some very heavy duty classical cats like Edgar Meyer and Gary Karr.
For all those electric players who chase tone, check these guys out. What they can do with a bow and a giant ol' double bass is amazing. That thing ain't small, ya know.
If you are looking for some challenging sight reading and classical parts to work up, check out some of his videos and then track down a copy of the scores for some finger twisting.