I changed my blog’s theme. I liked the colors and general layout of the old theme, but I finally got tired of how wide the margins were and how narrow the post column was. On the whole, though, I’d say the change wasn’t a very big departure from the past. Slightly less colorful, but I’ll live.
Anyways, my suspicion is that more and more people read blogs through RSS feeds and reader apps, making the actual layout of a blog less important.