Instead of stamping on a plain piece of paper, why not give your background a little flair? Painting a quick watercolor background is an easy way to add color and personality. And you can totally say, "I painted that."
Rubber Stamps (Thank You, Tandem Bicycle)
Watercolor Paints (I use this set, but you can use any kind of water colors. Even the set that comes with kid's coloring books)
Blank Cards & Envelopes
Start by brushing water across your paper where you will be painting. Then add your color. Starting with small amounts, let the water move the color around for you. For a more blended look use more water. You can always add more color and keep building your layers, but to start, keep it light!
If you end up with too much water on your paper, and it is taking forever to dry, use a paper tower to dab up (is that a phrase?) the excess.
Allow your cards to fully dry. You don't wan't your ink to run.
Stamp on your images, and you are done!