It is called glitter or vinyl, which has a flat glue on the backer. If you have cutting machine, you can buy vinyl by roll and shape it into the patterns you like through design editing software. There is also a convenient way for making bling bows. That's some iron-on transfers which combine vinyl and rhinestones. If you have heat press, you can order a proper size for bows and finish make only for one time.
Hope this will be useful: http://www.cstown.com/a-must-have-bo...tle-girls.html