While I love this idea, it's easy and inexpensive, I am somewhat skeptical of the permanent marker actually staying on the mug. Before you get started, here are a few tips that you should keep in mind:
1. Wash the surface of the mugs before designing your masterpiece.
2. If you plan to use permanent markers, don't forget that they are are not recommended for use on surfaces that come in contact with food. I would suggest only using them on the outside of the mug. As well, permanent markers have a high chance of washing off the mugs when put through the dishwasher.
3. If you are worried about your design washing away, and if you don't mind spending a few extra pennies on markers, I have read that pebeo porcelain markers are the way to go. Just like permanent markers, these markers are not recommended for use on surfaces that come in contact with food.
4. Follow instructions on the pen's packaging. Porcelain markers, for example, need 24 hours to dry before you bake them in the oven. Most sites I have read recommend that you bake your mugs in the oven for 30 minutes at 350F to set the ink. Don't forget to allow the mugs to cool completely before using or washing.
3. To preserve your design, try washing them by hand rather than in the dishwasher.
I have yet to try this popular DIY, but really want to give it a go as I think they would make for some great Christmas presents. Have you tried this DIY? Any other tips that you would suggest?