I've heard of tube worms working well in lakes and rivers for lakers, rainbow, and cutthroat (probalby browns as well). Since many tube worms are meant to look like bait fish or even crawfish, then you just need to present them as such. For immitating crawfish, browns and orange shades probably work best - hopping along near the bottom. And the fun part is, you never know when you get that hit, it the fish is a small mouth, large mouth, or a trout.

I also know that sluggos (sp??) - a soft plastic bass bait that mimics bait fish - work well for silvers in salt and fresh water. Shades of white, green and chartruse seem to work best. Again, think of the bait fish you are trying to represent...

And I know of folks who use various types and colors of plastic grubs and worms for targeting chinook and chum in rivers. Of course the pink worm is a favorite for steelhead and some like it for coho. This is definately an area that is fun to experiment with. Sometimes you just need to show the fish something a little different, and coming up with your own color, style, presentation, combo (try a worm tail hangin off your siwash hook on your spinners) can be very rewarding.