I find these cardboard frames really cute :)
They are similar to the already presented map photo frames.
Links:
The original site doesn’t exist any more and is now available through webarchive: Cardboard Frames (DIY: Una estantería con tapas de cajas empapeladas by Terrón de Azúcar) (Spanish)
via: DIY IDEAS FOR GIRLS
via: Little paper frames
Here at unikatissima:
Map Photo Frame