One of the most boring aspects of working with polyester is painting the paper. I like to have a 'library' of paper to work with, and sloshing dye over paper for backgrounds is downright tedious. So... get together with some friends and have a dye sloshing afternoon, preferably in the garden on a sunny day. The paper will dry quickly if you do that, and you can either swap bits or collaborate on one bit to have a challenge amongst yourselves. Cake is de rigeur...wine optional.
Above is a selection of lutradur coloured with transfer dyes.