First off : I made myself some homeade modge podge:). 1 bottle of Elmer's school glue, a mason jar (or other glass container), and water. Pour your glue into a jar twice as big as the contents of the glue bottle. Fill the bottle with water and dump into the jar. Shake well. Decopage much. Enjoy your crafty- self.
Secondly: Cut out scrapbook paper the same size as your backsplash tile/ old ugly coasters. Decopage that jazz onto your tile/ old raunchy coasters.
Thirdness: Spray them with a clear matte spray paint. Let dry overnight and put your sweaty drinks upon them to your little heart's delight!
Just realized I rhymed in that last statement. I rock.
Peace out cubscouts.