Mulberry bark, from the north of Thailand, is sometimes referred to as Kozo fibre or Kozo paper. The sheets look like thick scrim with several layers. You can pull the layers apart and soften the fibres in water to separate, and use them as strips of fibre or create holes and gaps in the wet fibres for great texture. You can use them to create 3-D shapes.
Layer them with Angelina fibre for an interesting contrast. The holes are wonderful for adding all sorts of other little extras and the paper takes colour superbly. Easily manipulated and stretched when soaked in water. Great for stitching on, backgrounds, layers etc.
To create all over texture with paint, paint the bark and then press the bark onto fabric until you have covered your fabric with pattern, Or use the bark like a stencil, dabbing paint though the fibre mesh with a stuff paintbrush. Of course it takes dye very well. The rest is up to your imagination.