I just designed and made it last night, I used a fabric I saved that was already hemmed from and old pair of small jeans I had. I just happened to be the right size so I didn't have to cut any thing. I hope you like it.
OK, so there's some math involved in making this. First Get your fabric, it can be a fat ribbon or t-shirt fabric(Just sew the fabric around the edge so it doesn't unravel) (I used fabric I got off of a belt(I saved the fabric). Measure the length around your head, add 6in, and that's how long your fabric has to be. Cut out a piece of elastic 3 inches. Fold on side of it over just a little and sew it like you would for a hem so the elastic threads don't unravel. sew you thread through one end of the fabric like the picture, finish attaching the fabric to the elastic, then cut off the string and knot it.
Now, closer to the side with the elastic, fold you ribbon, so it has the shape of a bow and sew the creases together. It should look like the picture here.
This is a close up of what the bow should look like folded over and sewed. Sew the last end of the fabric to the elastic the same way you did to the other side. Now you can bedazzle it with beads, button, sparkles, and jems. (I didn't)
Ta Da! Your done, now to wear it correctly, use bobby pins to make a poof with your hair in the front, than put the headband on over it. I hope you enjoyed this tutorial, if you need any clarifications message me. Leave a comment if you'd like. If you make one post up your version, I want to see it! Thanks =D