I had used Easter egg dye, food dye, Koolaid* and even Jello* (which I DON'T recommend. Great color-horrendous work and time removing the gelatin!)
I like your landscape Lindy. Very colourful. Did you do it with machine or by hand? I have been busy too with the felting. It is great fun experimenting with my new machine. Thank you for letting me know about Gilda Baron. I bought a book of hers on landscapes. It is very helpful with colours etc.