Take a simple pair of flip flops, which you probably already own, and personalize them with your own crafty sense of style using basic crochet skills. There are several ways to do this. Here are some ideas:
In this silent video, Cotton Pod shows us how to easily cover the straps of flip flops with double crochet stitches. You could, of course, adapt this idea to crochet with a different yarn and use single crochet or half double crochet stitches instead.
If you like the idea of doing a single crochet strap covering on your flip flops then checking the crochet tutorial from Crochet Kitten. She also shows an example of how you can then add a motif of your choosing (she selected flowers) on top of the straps to make an even fancier design.
Petals to Picots also likes the idea of flowers on flip flops and offers a crochet tutorial for making them using scrap yarn.
Going back to the single crochet idea, Poppy and Bliss shares a crochet flip flops tutorial for making striped flip flops using single crochet stitches.
Cre8tion Crochet also has a triangular crochet flip flop tutorial, written for the site by Lisa Egan. I spotted this one in a roundup of ten free crochet flip flop patterns from TopInspired, which also links to several other really cute ideas for crocheting per flip flops.
You can also crochet an entire pair of flip flops. Check out this flip flops crochet pattern by Mamachee.
Or as the weather gets a little bit warmer, wear your regular flip flops with little socks underneath. You can get a basic flip flops crochet socks pattern from Red Berry Crochet.
Or another option would be to take the soles off of your flip flops and then turn them into crochet slippers.