Felted Coaster Pattern

I want to make some felted coasters with some leftover wool yarn I have…does anyone have a pattern? I was thinking aobut just doing a large garter stitch rectangle with the length being longer than the width and then felting. Any thoughts?

You can actually cut the coaster shapes after you’ve felted. The felted fabric will not ravel. I would knit one larger piece and then cut into shape because the smaller pieces may get distorted when washing. Mary

felted round ones here