sinnoh fields. Though I may change to another sooner or later I simply enjoy this one. Makes me happy just coming on this site. Its too bad their is no pokemon x style. I tried the y one but to me its meh. Too dark. lol
I use Green's Ivy 2008. It goes perfectly with my theme, and it's a visually pleasing theme altogether. It's colors are also somewhat neutral enough that they work with everybody else's themes, as well.
There are a lot of great themes on this forum, though. Whoever makes them is good. =)
I'm using Modern for both my laptop and my mobile and will be using it for a very long time until something that surpasses its level comes out. It has this clean, simplistic theme which appeals very much to me.
Infernal Smash [Fixed Width]
I don't like wide pages. With a fixed width a page doesn't take up the whole screen.
(I like looking at the background even if it it nothing more than a pattern.)
960pixels (wide) is the most I lake a page of content taking up.