The first tile I wanted to use turmeric in a spray bottle but, I found that you cannot get rid of the tiny granules even after heating it. So I used a makeup wedge and just dabbed it on the tile. After it dried I covered it with my stencil and used blue watercolor to outline the stencil. Not very happy with it, but it is a good exercise to work with what you have.
The second one I did, I loved the color so much I didn't want to cover it up so I tangled behind.
My favorite thing to do is use inks or watercolor and blow them across the page and then tangle them. This is a recent ATC swap with blown watercolor.