Simple, clean, everyday cards. I have made gift enclosure cards. My cards are 3 x 3 inch square. This fits nicely to maximize my 12 x 12 paper. I printed my card stock using Everyday Greetings from The Cutting Cafe stock of printable stamps. It's fun to play around with colors and I do this in Adobe Illustrator.
Making use of the Gift Enclosure Card Box, I adapted it and the accompanying envelope, shrinking them both to my needed size. You can fit 6 or more cards with envelopes in the box.
Use these with a gift or as a pick me up. Put them in your kid's lunch, secretly leave on a co-workers desk, or add to a coffee gift card for a friend. There are many more sentiment to choose from over what I have shown. These are fun and quick to make.