I have stamps with low value and I think they are so beautiful, I like put some extra stamps on postcard or letters. The cost to send 20 grams is $430 (chilean pesos) almost $1 USD and the value of these stamps is $10, $20, $50 and $100 pesos. I can send just paper if I include other things like tea bags o other things the cost is more expensive and they send it like package.
You can see stamps with picture of Birds: Tordo, Curaeus curaeus ($20); Chicol, Zonotrichia capensis ($10). Body painting of people from Rapa Nui($10, $20, $50, $100). Valparaiso, Patrimonio de la Humanidad (World Heritage) ($50, $100)