I built this bed for my sister's new house. I used aspen for the visible boards and furring strips and regular lumber for the rest. The only change from the original plan is that I used 1x6s for the legs so it would sit higher off the floor.
I painted it with Rustoleum Painter's Touch Metallic in Oil Rubbed Bronze and I really like how it turned out. I didn't use any primer, so you can almost see the wood grain which gives it the illusion of being stained. It also has a metallic sheen in the right light, but it's very subtle. The only downside is the metallic gives it a rough texture. I contemplated putting a couple coats of poly over it, which I may do later.
*Picture was taken with her old full size mattress