I screwed one leg into each corner and one in the center for extra support. I didn't have time to paint or stain them since guests were coming in a few days but I'll get to that soon.
To cover the box spring, I stapled a flat sheet (cut into strips) onto the wood frame for a more finished look.
Here's one more cheap trick...
I had three beds and three mismatched comforters. By covering all of them in matching duvet covers (I found mine at Ikea) everything looks coordinated!