Easy to use and works.
There is No ui to uninstall a theme.
All I wanted was to submit a bug, because I use gpicview. gpicview crash after trying to save rotated image on which you don't have a permission. No warning, nothing - just crash. Version 0.2.4-1 on archlinux. It's stupid I can't submit a bug (only for admins) and there are forums where it says I should use bug tracker...