I have silkscreened cards (a lot of mess, as I recall, but very pretty).
Do you have any holiday rubber stamps? DD & I had lots of fun doing those a couple of times. Plain brown paper with repeated pattern is one idea, matte finish holiday paper overprinted, or a ready-made plain card with personalized embellishment.
Do you have a shape cutter? You could cut a shape from fabric to which you have already applied an iron-on backing such as Wonder-Under or Heat'n'Bond -- they work on paper, too.
Have fun!