These are really The Best Blue Slippers ever. Not only are they cute, but they hold their shape more than any other slipper pattern. This free crochet pattern has a defined and reinforced heel and toe, so they will last for a long time, as well.
Simple Crochet Slippers Free Pattern (for teens and adults)
These simple slippers are worked entirely from single crochet stitches. This is an easy pattern to follow. Link to instructions is here: http://crochet.about.com/od/slippers/a/simple-crochet-slippers.htm#