It all started with a large piece of old wood and some glazed cinder blocks we picked up at a farm last fall. The wood was free and the blocks were 25 cents each. At the time, we didn't know exactly what would be done with the blocks, so we ended up choosing different sizes and shapes.
So at this point, I didn't know if I actually had enough compatible blocks to use as a bench. I played around with them for a bit(heavy!) and was able to come up with a complete structure that fit together well enough and looked pleasing to me. So, the project was given the green light.