You can draw with them like pencils, then add water and they act like inks. For the butterfly I thought I should try my shadowpainting liner (which I normally use on paper only). The pencils worked well on fabric, only disadvantage is that they bleed. Someone recommended using Aloe Vera gel instead of water. Worth a try. To get the liner of was extremely hard.
Another fun thing I tried is dying fabrics with shaving foam and inks or acrylics.
first put a layer of shaving cream on your workspace
Then add drops of ink - I used acrylic inks
Random skewer patterns
Put fabric on top and lift off
and another one with a bit of silver ink.
I think I should try this again, but with more colours and different marble patterns. It's a fun way of making your own fabrics.