I used a combination of parts of the invitation which was sent to us, Mariposa card stock for the front background, and a package of embellishments by Life's Little Occasions (sold at JoAnn Fabrics).
Then the inside left:
(I covered the inside right since we had already written our messages to the graduate).
The card cost was way less than a store bought one. The embellishments were under 2 dollars, and the stuff I took from the invitation, which personalized it beautifully, were free. The card itself and card stock were just pennies!
Making beautiful cards, are so economical, and really fun, and much more thoughtful. I think this one turned out gorgeous!