Okay I've been wanting to make this headband forever!! And by forever...I mean more like 6 months... But check out this Double Sided Headband Pattern by Happy Together.
It can be a bit tricky trying to attach the elastic piece to the front piece but I would recommend securing the elastic closer to your seam allowance rather than close to the edge. That way the ends will lay flat and be easier to catch when topstitching rather than wanting to scrunch up on you.
If you have a jelly roll, this is the perfect project. the band will be a bit skinnier in the front but you could potentially make lots of little gifts or party favors for people!
Linking up here.