Two questions:

Even though I think the xp theme is fun I unstalled it some days ago. But it still shows up in the 'set theme' menu. How do I completely uninstall it?

A related question is that I'm trying to make my own theme but it won't show up in said menu. I copied the echo folder in /usr/share/themes to echo2, changed the theme name in index.theme and deleted the 'cache' files from the gtkrc folder in it, thinking it works the same way as with the icon cache. After rebooting I expected it to see in the theme selection menu but I didn't. Any idea why?