For more vibrant colors...Soak the towels in ash water, or if you can't find ash - add salt to the water (for about 20 minutes before coloring)
In a large bucket or container, soak towels
Make sure you protect your table. Use a disposable tablecloth or a tarp for protection
Mix the dye powders with warm water and place them in squeeze tubes
Put disposable gloves on to keep the dye off of your skin
Remove towels from the water
Squeeze the excess water out of towels
Use rubber bands to make the design you want. Some ideas are described below.
Place in garbage bags to retain moisture for several hours or overnight
Rinse towels in cold water until water runs clean
For the first few washes, wash each towel separately