I recently experimented with collage on fabric. It begins with a piece of fabric for the background placed on a sheet of glass or heavy plastic. Gel medium is applied, saturating the cloth, and then papers are layered on with more gel medium until you have a background that appeals to you.
After drying, the piece is peeled off the glass. Now you have the option to add whatever else you want. I sewed on some beads, added threads, applied crackle medium, painted on it, added illustrations and torn paper, and rubbed on acrylic paint glazes. Gel medium is applied over the surface to seal it. I like the matte finish.
A very fun experience and working on the fabric creates a flexible surface that can take quite a bit of embellishment. Consider the possibilities! I'm thinking about how this technique could make beautiful soft journal covers......