There are ways: - paint the whole thing white, then print on it. Bad idea. - strip the top layer off, then paint it white and print on it. Difficult. - print on some cardboard, then cut it out. Easiest, may get frowned upon.
haha, i pre ordered one of these things from starcitygames. I won't get it until next month though. You should be a unhinged/promo card disighner for Magic The Gathering. This would be awesome to run in a deck for fun. You should try one with Counterspell or maybe Llanowar Elf.