The 1st thing that I ever knit in the round with circular needles was a hat, I just found
this cute hat pattern. There are LOTS of hat (& many other) patterns
here. Is there something specific that you are looking for? Also, when you get circular needles, you can use them just as u use straight needles..I no longer use my single point needles, I just use circular needles, whether knitting in the round or back & forth :D