Great issue of BassMaster this month.  It had a super article on the hot colors to use.  It basically matched the optimum color choice with the clarity of the water.

Here's the bottom line:

Clear water - use lures in the range of green to brown (Pumpkin)

Stained water - use lures that vary from purple to red (Red Shad color)

Muddy water - dark blue to black (Junebug color)

Pretty simple - even I can remember this.