I made Sam's mobile. It's part of a tree branch from our back yard with stitched felt birds suspended from it. I love it because it's simple, it matches his decor, and because I love birds. But even more than all of that, I love it because for some miraculous reason, Sam loves to look at it.
He especially loves to look at it if you get it spinning a couple times and he can watch it rotate.
I bought a spinning motor. And he's in love.