I have been using alcohol ink on heavy glossy paper with some fun results. The colors do unexpected things as they are layered and become permanent when dry.
Here I have made book covers using hand painted paper inside and out.
This little book could be used as a journal or notebook and is has been posted for sale on Etsy.
And as you can see, I'm still making the bottle-cap buttons. They make such nice closures for the cord.
If you haven't experimented with alcohol inks, you might enjoy the results. There are some good tutorials online..... click here for an example. Have fun!