One reference coaster
Size 7 needles (Or larger, I knit really tightly)
1 ball of Lily Sugar n Cream
Cast on 21 stitches. Work four rows in knit 3 purl 3 rib. Work four rows in purl 3 knit 3 rib. Continue until size matches the reference coaster. Cast off loosely, weave in ends. You can get six coasters from one ball of Sugar n Cream, plus a long i-cord to tie the bundle together.
One of my tips in Stitch n Bitch Nation was "Design something. Even if it's just a coaster." I designed and knit a set of six different coasters for my sister, this is one of the designs. A co-worker asked for something knitted, this is what she'll get in the morning.)