If you don't know what the poll is asking, full-width skins stretch threads to the full width of the page, and indented ones do not. If you still don't get it:

Full-width:
  • Classic
  • Metallic Blue
  • Fluffy Puff
  • Under the Sea
  • Christmas in Narshe!

Indented:
  • Aeris Reborn
  • Old-Skool
  • Mog's Fantasy

I guess you may as well post what your favourite skin is (and which one you use, if it's different) too! Personally, I have been switching between Classic and Narshe lately, and use whichever one I feel like on the day.