I found a very interesting tutorial on how to tint fabric with crayons.
On the picture you see my first and up until now last (and not really successful ;-)) attempt at this technique: I laid a self crocheted flower underneath.
Better you try it by yourself ;-))
I preferred the acryl coloured fabric.
Links:
Tinted Linens
Let’s celebrate
Here at unikatissima: Acryl Coloured fabric