It seems that Thingiverse started to integrate Flattr.
So now you can give a lithttp://www.blogger.com/img/blank.giftle bit of money to the designers who's things you like.
I'm using Thingiverse a lot to publish 3D-CAD-designs I made. Mostly of practical things to print on a 3D-printer.
(And I am not using Flattr yet.)