What about rhinestone studs? with the little prongs on the back?
There's also
Aleene's Jewel-It:
Aleene's Jewel-It Embellishing Glue
Description:
If you’re all about embellishing, then this glue is for you! Jewel-It Embellishing Glue is a must have for all of your fabric projects that need a little (or a lot of) something sparkly added. This fabric glue is quick setting, making it great for working with hard-to-hold accents, and dries clear and flexible on both washable and non-washable fabrics. Use it for costumes, clothing, fabric jewelry and so much more!
- Permanently bonds jewels and accents to fabric
- Great for gluing hard-to-hold items
- Nontoxic
- Quick drying, flexible formula
- Dries clear
- Permanent and machine washable