a few days ago Microsoft released some new SharePoint themes, and i must say: they look pretty cool! You can download them at: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=0a87658f-20b8-4dcc-ad7a-09ad22641f3a
if you just want to download a wsp with the themes in it, go to daniel brown's website: http://www.danielbrown.id.au/Lists/Posts/Post.aspx?ID=256
at http://blog.drisgill.com/2009/03/microsoft-released-10-new-sharepoint.html you can find some larger images of each theme. Have fun with them!