This is a very simple project. All you need are some tiles from home depot, usually only about 15-20¢ each, some scrap book paper or a picture, mod podge, cork or felt, heavy duty water proof sealer/glue, and Krylon acrylic sealer.
cut the cork or felt to cover the bottom of the tile and water proof glue it to the bottom. I used a heave strength crafting glue which worked awesome.
Cut the picture or paper for the from of the tile. The tiles I bought were 4 1/4" so i cut the paper 4" even to have a little border.
Brush some mod podge on the tile, then position your picture/paper in the center. cover the picture/paper with mod podge. Be careful not to brush it too much or the ink will bleed if it's printed and the paper will start to bubble.
Let them dry completely, and DO NOT STACK THEM!!!
Once they are fully dried spray with the Krylon sealer. I put two coats on my coasters just to be sure.
Can easily be made as a holiday theme, or gifts.