Here's a hot pad I just finished. It didn't take very long to do, either. :)
I used the same yarn that I used for the scrubbies - Peaches 'n Cream yarn, but with a size I hook (I used a size J hook for the scrubbies). I just did single crochet stitches in a circle (joining each row, as you may be able to tell), until I ran out of yarn, and it finished at about 13" across.