You can always buy some fabric and dye it. I bought a lavendar color fabric and added 1/2 part black dye and 1/2 part denim blue dye, and also on another I just used the 1 part denim blue dye. Im torn between which one to go with :confused :facepalm. Just make sure that if and when you buy some fabric (I got mine for $2 a yard) to buy a 1/2 yard extra to experiment with the different mixtures of dye.
-Joe