Wash your shirt and leave damp. Lay on a flat surface.
Crumple your shirt into a small bundle using your fingers.
Use rubber bands to secure the crumpled shirt.
Lay crumpled shirt on a rack over a large plastic tub. This way the dye can freely drip down into the tub and not puddle under the shirt. Place ice cubes on top of the shirt.
For this technique you want to use dye powder, so do not fill up the Tulip One-Step Tie-Dye bottle with water like you would normally do. Simply remove the caps and squeeze dye powder randomly all over the ice in colors of your choice.
Let the ice melt! This will take anywhere from several minutes to several hours based on your location and temperature. You will still want to let the shirt set for 6-8 hours once the dye has seeped onto the fabric.
After the dye has set, use scissors to cut off the rubber bands. Reveal your ice dye design, then rinse out the excess dye until the runoff is clear. Wash and dry according to the dye instructions.