Really digging this SHARPIE TYE-DYE TILE project over at Sharpie.com's Project Blog
You color the tile with sharpies, then drip very small drops of rubbing alcohol onto the marker and it dissolves the marker to give it a tye-dye look.
Here's the tile before dripping the rubbing alcohol.
White tiles with felt taped underneath make great "reminder" drink coaster for a kids' bedroom, or a talk-piece in the kitchen.
Sharpie.com says that it takes 30 minutes for the tile to dry, which is plenty of time to do the Bible study and another activity. The 'finish' coat they recommend could be a single spray of polyurethane or acrylic spray to "FIX" the marker to the tile. Dries to the touch in 10 minutes and cure on the way home. Send it home in a small cardboard tray/box. Experiment before using so you know "how much is too much."
In the version above, I colored the "coat" graphic, but afterwards realized I could have also decided to just use the coat graphic to 'block out' the white tile underneath it -and only color AROUND the graphic. The wording did not have rubbing alcohol applied to it as it made it unreadable.