A mat board collagraph print can be made very simply by cutting shallow shapes from the board. Here are photos and links to video tuorials.
Collagraph Prints from Mat Board - a Beach Portrait - Belinda Del Pesco
Mat Board Collagraph Print: Stackable Naps - Belinda Del Pesco
Mat Board Collagraph Supply List Printmaking With Belinda Del Pesco (Download Now)
Collagraph Print Portraits of People and Pets - Belinda Del Pesco
Mat Board Collagraph: Harmony House (& a new process video) - Belinda Del Pesco
Collagraph Prints from Mat Board - a Beach Portrait - Belinda Del Pesco
Lightweight Single Weight Matboard, Mount Photos
Mini Mat Board Collagraph Print of a Sleeping Cat (Timelapse)
Mini Mat Board Collagraph Print of a Sleeping Cat (Timelapse)
dfgdfg Art Board Print, dfgdfg photography
Mat Board Center, White Backing Boards - Full Sheet - for Art, Prints, Photos, Prints and More, 10 Pack, 12x16