Zoom's "Watermelon Magic" is my favorite.

Gangreene colored tube.  It is a light colored watermelon with black and red flake and smoke colored tails.  It is a dead on baitfish color.

I generally stick with any earth tone/natural color for really clear water. All of the ones mentioned before are good choices. My personal favorite would either be baby bass or green pumpkin. Like Basser89 said too...Idunno why, but I have done well on red shad also.  My PB largemouth (11.6) fell to a red shad culprit jerkworm, and it was in gin clear water.

Green Pumpkin and Watermelon/Red Flake.

watermelon....  i like watermelon candy...has some nice red and purple flake to it