Tsumiki-Like Blocks
I was inspired by a Wired article a couple weeks ago about Japan's "minimalist vresion of legos" and decided to make a simple minimalist kind of construction toy myself. A single "block" is two short planks joined to make a "V" at a 60-degree angle. Each plank has a matching 60-degree notch at the bottom. That's all it is. I uploaded .stl files to print 1, 7, 21, 30 or 57 blocks at a time.
Customizer will allow you to scale them a little smaller depending upon your needs and/or printer.