you can probably make up a pattern, can't you?
Assuming you want to make this hat for yourself, measure the circumphrance of you head. If you're making it for someone else measure there head or, if you're being sneaky, measure the width of their hand (thumb to pinkie) and times that by three.
Then make a gauge swatch and find out how many stitches you have per inch. Times that by the number of inches you need, and cast on that number.
Work round and round and round (you can do ribbing or fair isle or lance or whatever you want to do) then when you get to the length of your hand, from base of palm to tip of middle finger, you should start shaping for the top.
What you can do is pick a humber between 5 and 10 that can divide into you're number of stiches (ex: if you have 63 stiches, maybe nine?) and then, using the nine example, you would knit seven then knit two together. Do that around, knit a row plain, then do knit six knit two together around, knit a row plain, ext ext ext.
One you start knitting two together all the way around, you can pull the yarn through the remaining stiches and applaud yourself
BTW, if my explanation makes no sence, there are tons of great books (Knitting Rules by the Yarn Harlot) that can give you a better no pattern hat pattern.
Hope this helps