I found a bag of little finger skateboards about a month ago at Party City (also available on Amazon) and bought them because I thought they'd make great valentines for my 8 year old son.
It took me a while to figure out how I would use them. Here's what I came up with:
I created the card on my computer and had it printed at Kinkos (I used this promo code for 25% off: ECK625). My son used a hole punch and pipe cleaner (cut in half to attach the skateboards).
If you'd like to make your own, you can download a free PDF printable here.