Another simple process that gives an interesting result. The background is essentially finger-painting: add blobs of paint to the card and smoosh it around until you are happy with how it looks. Add a few marks and splatters and, once it’s dried, you’re ready to add the background text. This is not a stamp, it has been created by sticking some clear packing tape to a book page, using water and rubbing to remove as much of the paper as you want and then gluing it to the card. A few more marks over the top and a word sticker (or more words from the book page for consistency) and it’s finished.
Acrylic paint, old book pages, clear packaging tape, black marker, gel medium.