Simple one ball blanket pattern request

Currently knitting hoodies for twin grandsons using a 3 ball skein. Says it will use 2 balls for jacket. Thought I could do a little matching blanket with the remaking ball. Anyone have a simple pattern using just one ball? Tks

it would be easier to give you an idea if you give us the yarn weight (cobweb, lace-weight, fingering ect.) and the yardage you have

I’m not sure that one ball would make a blanket. But more info will help us.