The newest product from the scrapbook section at the dollar store: cut & fold cards. They even come with envelopes! There are four to a pack. Add to this some stickers from the same section and some glitter glue (Wal-mart, 79 cents).
Fold the cards up and then embellish with stickers, outlining the design on the card and the sticker with the glitter glue. Looks pretty good, if you ask me.
If you really want to splurge, add some trinkets. These little keys came off of a pair of dollar store earrings, and make the perfect little shiny 3-D accent!