I noticed the first Template got listed this evening… congrats! I’ve got a suggestion as far as the Template distribution and installation go, though:
Make use of the Template Library.
Seems to me that the easiest approach would be to make the Templates so you could just drop them in. Save them with the .tpl extension and then package them so that you just drop them in a subdirectory of system/templates/.
Then create the Template Group and when you create a Template inside it, base it off the appropriate one in the ‘Template Library’. (This brings up the fact that when you create a Template Group you should probably be able to select to have it pre-populated from any existing subdirectories/groupings in the Template Library.)
This approach (using grouped .tpl files and putting them in the Template Library) should allow you to easily have several pre-made “themes” ready to go and you just choose what you want when you create your Templates.