sharpie tie dye sharpie markers, then dripped rubbing alcohol on the designs and watched the ink spread out. I got the droppers from a pharmacy, and the best buy on markers was at Costco. As for the rubbing alcohol, we used solution.
Make a Flour-paste crackle effect- Spread flour-water mixture over fabric, let dry. Crush to crackle it, then paint fabric. The dried flour mixture acts as a resist. Then washes out. This might work for a "batik" look, too! Use 1 cup flour with cup water