To be festive, I added a string of colored led lights to a sequined Santa hat. The cool part? The lights show through the white faux fur brim. The battery pack fit inside the brim in the back, and I wrapped the lights loosely around, then used white thread to make a basting stitch around the brim to hold everything in. The long stitches will be easy to undo, should I need to remove the lights, and I left a gap just large enough to slide the battery pack out.