I used the same technique described in this post but I did a serving platter with the bride and groom's last initial on it. I didn't have a stencil or a silhouette (which would have made it easier) so I improvised.
I printed 3 different fonts/images from my computer and tried them all out to decide which one I would use. Then i cut out the one I wanted with an exacto knife, taped it on with thin strips of masking tape, and used the ceramic paint pen to roughly outline my letter.
Then I removed the letter and filled it in with my pen. I prefer the paint but I only had the pen this time. Both have their pros and cons and can be used together. Then I cleaned up the edges with a toothpick and baked it.