This robot project is my reason to dig back into neural networks. My intention is to take an existing robot platform (e.g. Roomba or a cheaper knockoff), remove its brain, and install a new one that I can use with various "deep learning" frameworks.
Marvin is the longest-standing robot test-bed in my graveyard of robots. This robot was a favourite at my kid's school. If you are just getting into NXP "HC" series processors and you like to bare-metal program, then maybe Marvin has something you can use!
My daughter's WallE robot. Edited so that it chases things now. But not very well.