1. Hem Pants
You're in a rush and just realized your hem has gone down for the count. Get out that glue gun and go to town. Later on, just peel the dots of glue off or leave it on while you sew. Use only small dabs and not full lines of glue: This makes removing the glue easier, and it won't stain the clothing. When I have done this in the past, I usually forget, and the glue just remains unseen. Washing the clothing has no effect on the glue's adhesion.
2. Fix Buttons
You're running out the door and notice you have a button that is about to fall off. No time to sew it? Just run some hot glue over the threads and go. Your button will stay in place, and when you have time to sew it, the glue will just pop off the plastic. Unlike clear nail polish, the hot glue won't damage the button.
3. Emboss Cards
The glue gun is perfect for embossing just about anything: In other words, it adds a decorative raised ridge to any surface. Once you are happy with how it looks, just apply nail polish over it for a high gloss lacquer finish or use a colored stick. You can also use a glitter stick.