I do get that urge sometime. I use Debian with gnome3. When I get that urge, I go find a good looking theme. The new theme makes it feel like I have a something different. This used to happen quite a lot when I was in my 20s and early 30s. Not so much anymore. I guess I have many things that need to care about other than my computer. I haven't changed my theme in two years, not even the background.