I haven't specifically targetted them, but my friends that do rely on crayfish patterns & egg flies. Also #8-10 Bonefish type patterns, but in drab colors that match the bottom (browns/olives). Patterns that are tied inverted with bead chain or small dumbell eyes allow you to crawl/hop your flies on the bottom with minimal snagging. I think FK or someone else put up a post with a picture of some Carp Flies in the Warmwater section.