Ok, so I'm late to the ball, but just had to comment. They're not formal dishes, but
www.merrybelles.com has some neat options for ceramic/stoneware items with Greek letters. Hubby and I have our red/buff roses things as well as violets alongside my squirrels and his lions (see a theme here?). If GLO is as important to bride & groom as it is to you, then go for it. Otherwise, you might consider a shower gift with letters rather than your formal wedding gift.