Diana,

What Silver Hilton said is right on. Earth tones are typically what you will score on. Most of the guides will have you tossing crazy charlies or some other shrimpy looking fly. For the color, you want the bug to be relatively close to the same color as the background. In other words, dark sand, dark brown fly, light sand light brown to almost white fly.

Leave it to RT to try to dangle his pink worm into every thread...