I actually found this in the bottom of a box while I was cutting up my pile of empty boxes (I don't know where it was from, as it didn't have the shipping label left on it), so might have fallen into my box by mistake... or could be something I need but don't realise.

Anyway, it is a little smaller than the size of the photo, and is obviously Japanese. (I have a feeling it might be a Kabaya sticker sheet, but haven't looked yet).