Yep, you can color on fabric with all sorts of coloring tools. Markers, pencils, crayons...loads of stuff. Pull it out of the drawers and just play.
I started this piece a while ago. Stencil with paint on muslin. I love sunflowers and have been wanting to finish it as an art quilt. Let's see how far I can get.
First, I started coloring the flower petals with water coloring pencils.
Next, dip a paintbrush in a bit of water and spread the color around. Nice! I got turned onto water-soluble oil pastels a few years ago. I had never tried them and now I absolutely love them. Loads of rich color that you can add water to and spread it out onto the fabric.
These are the pastels I have...Portfolio. They weren't expensive which was why I decided to try them. You know I have too many art/papercrafting/fabric supplies and when something is not expensive I can easily purchase them and give them a try.Feel free to mix various coloring tools on one piece...they all mesh together because they are all water-soluble. Keep adding color until you are satisfied with the results. Add color to dry cloth or to wet cloth. With each you will get different results, so experiment.