This little rug didn't take much time to make at all, so it's great evening craft-project. And you can use any pattern you want.
Start off crocheting as you would normally.
Be optimistic: try to keep the weft in the bag it came in ( :P )
Get crazy at the weft, then roll it into a ball. Cont. with crocheting.
Fasten off the weft and say "Ta-daa!", because you're done :)