pin. up. clock.
This cheery timepiece is made with 12 pushpins, a square patch of bright green felt and some clock guts. It will go...well, wherever you feel comfortable sticking 12 pushpins into something, so probably not a wall you don't want 12 tiny holes in. Maybe it's best to start with a bulletin board and move on from there after you've gained some experience. It's only $28 but you have to supply the AAA battery.