My students love scratch off tickets. These are editable so you can put your name on them or type your prizes in the box (You will need to insert a text box in the square shape). I like to leave them blank so I can change up what they win.
These are best printed on card stock. They hold up better to the clear tape and paint; however, they do still curl just a bit.
***To make it a scratch off, write or type in the box, cover with a solid piece of clear tape, and then paint with silver paint that has been mixed with 1 part of dishwashing liquid and 3 parts paint. I do a squirt of dishwashing liquid and then three squirts of paint. It doesn't take much paint to cover alot of scratch offs.