This is the first time I've dyed a plastic bag! Didn't mean to but the fabric which was being dyed was inside it, and it was too good to throw away. Instead I used it as a texture to go with this tree -

- which became this image using this "recipe":
one of my brown textures - overlay 97
plastic bag texture colour 100
copy of tree normal 72

I opened a new page and copied and pasted selections of the image, duplicated the background and moved it, changed a few colours and added a frame, ending up with an abstract image.