This is a pattern my mom taught me how to do that is really easy. You can get a dishcloth done in only a couple hours!
Worsted weight cotton
Size US 7 - 9 needles, depending on preference
Skill level: Easy
Cast on 4 stitches
Knit a row
Knit 1, yo, knit until there is 1 st left on the needle, yo, knit 1
Continue in this pattern until you have 40 stitches on the needle, more if you want a bigger dishcloth.
Knit 1, k2tog, knit until there are 3 sts left on the needle, k2tog, knit 1
Continue in this pattern until there are only 4 stitches left on the needle.
Bind off and weave in ends
If you make this pattern, let me know! I'd love to see what you come up with.