Something a bit more practical made with TopMod, and with a direct reference to RepRap myth and lore: an organic, topologically generated shotglass which should print just fine in a RepRap or MakerBot but be a bit more interesting than the usual spent-ammo-casing tubes...

Afterall, who wants to toast a new 3D printer with something you could make in a lathe or in a mold?

EDIT: Added a variant with a twist. Same licence, download, modify, print... or do what TMR did and make your own from scratch after you see the tutorial video!

EDIT: Added a variant with a flat base and a diamond pattern in the filigree, as per Zach\'s suggestions. It should print more cleanly.

EDIT: It slices in Skeinforge, and it prints on a MakerBot. Screenshot added.

I think this one obeys the rules, the ribs are nice and strong, and the bottom is flat. There\\'s a solid hunk of material supporting the bottom of the inner web and mating it with the base of the shotglass (see the cutaway view from Blender).

We won\\'t know for sure until someone prints one, but this one might be a keeper. :-)

EDIT: If you want to learn how to make the file for yourself in TopMod, here\\'s a video tutorial on the process:
http://www.youtube.com/watch?v=fwSV89_syBM

You can get TopMod here: topmod3d.org/

If you want to make a derivative of this Thing, download the .obj file on this page and open it in TopMod.