I like medieval or nature-y themed builds, and the best thing I've built so far is my architect project. (Still a work in progress at my plot 1 )
I like futuristic things, and my best build is the Stanley Parable map I am currently working on. Edit: Now my best build is my replica of the Stanley Parable map on my second plot.
Terrain.. Temples.. Castles.. Shit like that. And my best build was a replica of a castle from a book. So ya
My fav building theme is ... erm modern and old timey things, my best build my designer plot by far....
Medieval-ish, bit of terrain work. Best was my unfinished shrine of worship from back in the day. Link to the old thread - http://www.minecraftserver.com/forum/threads/forbidden-lands-from-sotc.162/ I was almost positive that there were more pictures of the build in that thread, but apparently I was mistaken lol. Heres a video with it and other old builds from the server. (All in survival btw)
What I like to build? I like house-building (villages) I don't even know what the "style" of my houses are xP. My best build would be my WIP architect plot (/p h GamerTag_) I also have a WIP thread of that plot in the Creative Building Projects (I will post the hyperlink to it later).