I just ran across this pattern on-line, and think it looks really good as a pattern for warmwater species. Pink-n-white or Chartreuse-n-white should be great for crappies; crayfish colors (browns/tans/oranges) for smallmouth bass & carp; shad colors for white bass/wipers, etc.
If you click the link below and then select "Printable Version" or "Click here for tutorial", you can scroll to the bottom of the tying instructions to see some color variations already tied.

Could make a good shrimp fly for the saltwater anglers too. Anyway, just thought I'd share it with you guys (you've probably seen it already!).

http://www.charliesflyboxinc.com/fly...fm?parentID=11