I messed around with putting words together for searches a little bit during lunch and came across a link that may be promising. I'm not going to post it here because I'm not sure of the source. I'll order a couple of pens and if I like them, I'll let you know.
In quilting, I've used a vinegar rinse with batiks and hand-dyes, it sets the color nicely.
Cynette, experimenting on canvas or cheaper shoes is a great idea. Thanks. All those years of doodling just may come in handy here. Let's see, 50 + years of doodling on scraps of paper, telephone books, homework, class assignments, letters, to-do lists, love notes. I'm well practiced. Get ready, Kara.

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Excellence is contagious. ~ Andy Baker, President, AndyMark, Inc. and Woodie Flowers Award 2003
Character cannot be developed in ease and quiet. Only through experience of trial and suffering can the soul be strengthened, ambition inspired, and success achieved.
~ Helen Keller (1880-1968)