Oh my! Am I the only 'change-a-holic'? It's hard to put a regularity on it though. There are some weeks where I add a page or tweak my design and then some weeks are so busy that I leave it alone for the most part.
Since I switched my site over to the Headway theme I've been like a kid in the candy store. Now it's so easy to change colors, add a sidebar, etc. that I don't even have to worry about it taking time out of my work day. I've been known to add a new design element during my lunch.
If any of you visited in the past few weeks you noticed that my site was even 'decorated' for Christmas. I 'took down the decorations' yesterday during a coffee break.

Maybe it's caused by watching too much HGTV?