A little more about the process designing the little robot in the logo of the IEEE Automaton Weblog.
The sketch in the middle was the one that captured best the overall tone they wanted to set for the blog, a homebrew, clunky, hobbyist-friendly robot. I did the wireframe (left) just as a WIP shot, but it ended up being selected over the final artwork (right, and also here toon shaded). You can see that the "eyes" and the wheels are pretty much the same throughout the process (and maybe the only parts that resemble the initial sketch :) ).
Those were modeled in Wings3D, the most user-friendly and easy to learn 3D modelling package. It's also free and open-source, and is probably the most famous program coded in Erlang, discounting the hardcore mission-critical telephone centrals manufactured by Ericsson.