The Sculpt Mode in Blender has been upgraded pretty significantly for 2.5!

To celebrate, I've uploaded some .blend files which are already set up for sculpting. There'll be a tutorial on the Thingiverse Blog later, but if you've used Blender to do a few things like model scaling, opening one of these in 2.5 should be mostly self-explanatory.

The different files represent different shapes to use as start points. They all have flat bottoms and so they'll at least start out printable!

1: Get Blender 2.5:
http://www.blender.org/development/release-logs/blender-250/

2: Open one of the .blend files and start sculpting! Just click anywhere on the model and watch the surface bulge out as though you were sticking clay to it.

3: Try messing with the options on the left side of your screen-- there's mirroring, different sculpt modes, and each mode has options.

4: Export-- Blender 2.5 doesn't support STL yet (email the developers!) but since it has .obj we can get around that.

5: Print!