A tato is a traditional Japanese purse, a kind of container that can be used to store flat items. Tatos can also be used as an envelopes or letter-folds, to send messages to your love ones on Valentine's Day.
The Star Tatos in the picture above were created by Tomoko Fuse. The diagrams can be found in her book, Origami Wrappings, ISBN 441630501X.
I folded each tato with a 6" (150 mm) square of duo origami paper.