American penmanship is becoming extinct, so I think its so nice to either get or give a handwritten card every now and again.  These little keepsakes are adorable:

Congratulations  Flower Card by Artecnica
Happy Birthday Flower Card by Artecnica
Bravo Cartolina Cards
Salatiga Note Cards
Bird Letter Press Cards
Thank You Seed Cards – instead of throwing the card away, [...]