Here are some of the headbands I've made for my children with the Let It Snow! Quick & Simple Headband. I've actually made a few more in different colours, but alas, I didn't think to take photos and they now belong to other people.
These headbands are great when the weather isn't super cold (for those really cold days, try the Let It Snow! Simple & Quick Hat). The kids love them. If they are not wearing them as a headband, they put them around their necks like cowls, so really they have two purposes for my boys!
I really enjoy crocheting these and have gotten a lot of compliments on them.
A link to the pattern by Oombawaka Designs can be found here