Make your own envelopes
These are envelope templates you can print. If you don't want any text, just erase all of the text, but you can add names, addresses, and a short message to the envelopes.
There is a spot at the top right where you can add a picture as a stamp. If you don't want to do this, just don't upload a picture and spot will be blank. (Hit the "preview" button at the bottom to remove the image uploader from the screen.)
make cute thank you cards, birthday cards and cute invitations you can
customize with a photo and personal message. Erase all of the text in the card to
make blank card templates to print for free. The free online card makers will create the perfect card for friends. You can also print personalized envelopes for these cards.
You can find more cute printables in the cute invitation and announcement section. These are 100% customizable and can be used as flat 5x7 or 4x6 birthday cards.