Hat pattern

[willow-starr.livejournal.com]

Does anyone know of a good (and free) online pattern for a ribbed hat? Or could help me make a pattern. I want to make a hat to match a scarf and arm warmers I made but I'm terrible at creating out patterns. It ideally would be k2 p2 made in the round- how would I decrease the top for it to look nice?

Thanks for all your help! I'll post pics of the whole set as soon as it is finished.