Here's a method for achieving a textured, stamped background, or adding stamped images to an uneven background.
1. Take a sheet of tissue paper and stamp all over using Ranger Archival ink.
2. Use a brush to cover your surface with Claudine Hellmuth matt multi-medium and press the tissue paper down, crumpling as much as you like to achieve folds and texture.
3. Trim excess tissue paper from the sides of your project using scissors.