Before you say this LED Controller doesn’t look micro, have a look at the board in the picture below with a 9 volt battery snap to compare it to. This board is tiny! You could hide this thing in model cars, train sets, props, this list goes on an on. Also the interface is a single button, it doesn’t get much simpler than that. 🙂
Via: HG Forum
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These guys have some pretty small boards too:
http://www.lifelites.com/products/list/1
Looks like the eLite Jr. has a built in battery and fits in a LEGO brick.