Super quick is the Crochet Fast Shells Dishcloth. It's a repeating stitch that makes for quick dishwashing items. Great giveaway items.
The yarn colours that are not in use are carried up the sides, so you don't have many tail ends to deal with. Before I knew it, the project was over, it was that quick!
Be sure to use 100% cotton for dishwashing and kitchen needs, as cotton can handle the water and constant washing.
If you love this concept, you may love the Crochet Satisfying Shell Stitch Blanket. It's the same concept but in a blanket. The stitch multiplies for blanket sizes 6 chs + 2.
If dishwashing is your thing, how about this unusual approach, mitered dishcloth? There's more to it than it looks, and a tutorial is there to help you out as well.