I bought 4 of these from the garden section. and slathered them in mod podge.
Margareta fabric from a recent trip to IKEA, with the plans of stretching it over canvas, done and done. (it is huge!) With the trimmings, I matched up some of it to fit over the coasters.
After a few minutes of letting it dry, I flipped them over and cut around the coaster as close as i could.
I let it dry a little longer before spreading the top with mod podge and letting it dry. I did a few more coats and came out with these amazing coasters!
This is really easy project, and it doesn't cost much money.