I saw this on Pinterest and thought it would make a good project to do with my grand kids. Simple 4" ceramic tiles for the base, Sharpies, rubbing alcohol, gloss spray sealer and felt pads for the bottoms are all you need.
Wipe off the coasters with a damp rag.
draw, scribble and cover most of the tile with 2-3 colors. We found that more solid patches of color worked better than tiny dots or lines, but do what works best for you, you can't mess this up.
Pour a small amount of the alcohol in a bowl then using an eye dropper or a teaspoon drip the alcohol over the tile in puddles.
Walk away and let this dry then do it again and again until you are satisfied.
Don't mess with it too much or you'll end up with a muddled mess, I know from experience. You can however blot extra liquid with a paper towel and keep dripping. On the first one I messed with it too much so I wiped the tile with more alcohol to clean and started over. When they are perfect, to you, let every thing dry well then spray with sealer and add 4 felt pads to the bottom of each coaster.
Such a cute gift for parents, grand parents, teachers etc.