Here is a wonderful cap knit flat. I have one more pattern that is knit flat, but is also a toboggan type cap.
If you don't like DPNs or they intimidate you (been there and hidden under the covers at the thought) you might try getting 16" circs and trying to knit caps on those. I'm a recent convert to knitting in the round on circs and it makes like so much easier as well as not having to constantly be shitting needles, stitches, etc. I'm making simple caps now for my kids with their names or some symbol on them. I plan on trying a cap with flaps next. They love them and get a kick out of something made exclusively for them.