Here's a great pattern that I used for years, as have many of my friends, as tied here by Tim Flagler. The peacock caddis has many of the elements of other effective multi-purpose dry flies - peacock herl body, a deer body hair down wing and grizzly hackle. It works during caddis hatches, as a searching pattern, and in smaller sizes it is an effective flying ant imitation. Another variation of the pattern is the use of two hackles - a grizzly and a brown. Either way, the pattern works well anywhere caddis are found.
Sharpen your hooks!