A knitted washcloth is a quick and easy-to-make gift. Wrap it in pretty paper with a lovely bar of soap. I have a couple of free washcloth patterns ready to download in my Ravelry Store.
Easy Peasy Lemon Squeezy is an easy washcloth to knit - it's a garter stitch square knitted from corner-to-corner using simple increases and decreases to form the shape. Knit this pattern in two or more colours or use a self-striping yarn. A pure cotton or a cotton/synthetic blend yarn works best for a washcloth.
Leaf Lace Washcloth has a simple lace pattern surrounded by garter stitch borders. The lace pattern has written instructions or there's a chart if you prefer to work from one. Yarn choices as above.