Today we were supposed to get a tooth pulled out (!) so we printed something very simple and relaxing: stevemedwin's Space Family Puzzle on Thingiverse. By "we" I mean "I" and by "supposed to" I mean that I ended up not having to get the tooth pulled. Long story. But it did have to do with my eyes (?!), and this model reminds me of a sad, downward-looking eye. If you want to think of happier things you can take stevemedwin's interpretation of this as a comfy space family all nested together.
Thingiverse link: http://www.thingiverse.com/make:76266
Settings: Replicator 2 with .3mm/low, as usual.
Stuff to change: This model printed in one piece, with everything nested together. This was great for the interior sphere and its surrounding circle, but was less great for the other nested circles. Removing supports from between the circles was tricky and in the end the exterior circles can be taken apart and put together again anyway, so I'd rather print this as ball-in-little-circle with two other separate circles than all nested together.