I said I'd post something on music, so here's something I dug up to keep my promise.
My son is learning to play the guitar, and I'm polishing up my theory at the same time. So I decided to make a multi-colored display of the guitar fretboard so he could see where all the notes are--and relate them to the staff. (Middle C on the piano is C4).
It's not a lot--but it's a start.