One point of warning here: When creating a new Theme remember that the Theme.css has eight (8) hard referances embeded that will need to changed to your new theme name. For example the Theme.css for matrix has "background: url('../matrix/images/tab_bg.gif') repeat-x bottom;".
If left unchanged they will redirect back to whichever theme you cloned to start your theme with.
When I edit the tpl files it seems everything is cached. After a bunch of trial and error I discovered in order to view the changes I've made I have to delete everything in my g2data/smarty/templates_c folder. Is there a way that I'm supposed to get rid of the caching, or is there a way that I can temporarily disable it while I am working on the page?