If you aren't one that needs a self supported style of tent, the original tarptent MYOG designs from 10 years ago are still pretty relevant, as is the rayway tarp and net tent. Most of the designs since then have moved much closer to tents, adding weight, features, privacy, and weather resistance.
From a design standpoint, I like the moment and the rainbow from TT above all others. The rainbow can fit 2 and is close to free standing sans hiking poles, and the moment can be free standing and bomb proof with optional poles. Both are a bit complex for MYOG i think.
What design styles have you been considering so far?