Because it took me a while to find I thought I would put a link to the Plankton theme in the N800 forum (especially since it says on the creator's site that it is a N800 only theme). Thought it might save some time for others who are looking. It works (so far) with the newest OS (memory-card-issue fixed).

Note that it states one needs the hildon-theme-cacher to work.

http://www.tigert.com/archives/categ...ware/maemoorg/