I bought some of those tiny paint samples from Home Depot for about $3 each. They'll get you any color you want. You get a lot more paint than you would from the craft store that way too.
WHAT YOU'LL NEED:
•Wood blocks or any other surface you want the letters transferred to
•Printed sheet of letters of your choice in font of your choice | I used one of my faves Deming. It's free here.