If you've ever looked at the iPhone-specific Joby Gorillamobile
With a spare case, acrylic paint, some epoxy and sandpaper, a nut, and the ever-popular Gorilla Glue, ogcidman911 created a simple yet effective EVO case that can be easily mounted to just about any camera/camcorder tripod or other accessory that makes use of a 1/4" screw.
A small flexible tripod
If you want to make your own custom tripod-compatible case for the HTC EVO, check out ogcidman911's video tutorial below.
Thanks, Enrique!