I sorted through my tea and iron dyed fabrics. My favourites were some little strips of linen and some wool wadding.
For my project, though, I wanted something less dramatic!
I settled on a piece of dyed linen table napkin for the background and some recycled muslin lining for the middle layer. The foreground is 18 squares cut from dyed and printed fabrics (thermofax images of feathers), some of which had feathers attached.
I love the result: