Mug rugs are made like Coasters... only they can be Quilted in any shape or size... good way to use up scraps of fabric..Have to check out what they put inside, don't want them too puffy or liquid to go through...? I have seen some at a craft sale that were selling for $2:50 each... simple piecing... and if you are using scraps - NO cost .
Square ones, round ones, rectangles etc.. Hey any shape ...bind edges in contrast or matching colors/fabric.