I am not a great artist myself.....but I've been doing some paddles lately.
Simple ideas that don't involve anything but the paddle and paint: Get a cheap paddle from
www.paddlemegreek.com. Spray paint it one of your sorority's colors. Get a paint pen in the other color. Draw the letters big on one side, write a personal message on the back.
Or, you could purchase those wooden letters, spray paint them SEPARATELY from the paddle, then stick them on when everything has dried. (Most letters are self-adhesive these days.)
Otherwise, I second L.O.C.K.'s advice.