I did the crocheted headband pattern you picked out today. I think there are some adjustments that need to be made (I'll probably want to use a smaller hook than I used this time--I was one size up from pattern requirements), but the pattern is uber-easy to adjust.
It took me 15 minutes to make one. Of course, it will take you a lot longer, because you'll just be learning. But it's a good pattern to learn with, and I think the band is actually really really cute, in a Jane-Eyre-y sort of way.
I also used scrap acrylic yarn to make it, because I was testing. But I have some scrap cotton yarn that I'll bring when you want to try. It might be easier to make one with acrylic first (because it slides better, and stretches a little), then move to cotton. But whatever.
You wanna try after Mass on Sunday?