This is "Begonia," block 181 from Jan Eaton's 200 Crochet Blocks.
By the way, I love this fabric. I believe it used to be a pillowcase.
And I made a new mug cozy. This one is bigger than the standard coffee cup size (which is probably why it is my favorite). I used the same pattern as before, from smushedsquirrel on Ravelry, only with a larger hook size.