I've been slowly banging away at these for a while, and now the fun part is over. I tried to make them look like they weren't all designed by the same guy. It helps being an inconsistent artist. http://www.inpayne.com/models/kitbash/trekpage_patches.html If you need to see them in context with the ships, each entry has its patch at the end: http://www.inpayne.com/models/kitbash/trekpage.html
I like . . . well, pretty much all of these, but especially the Perry, Bucephalus, and Tiburon. Those are just the ones that pop out at me the most. There are some nice touches on a lot of the others too.