Chicken wire filled with colored paper? But instead of crumpling the paper up like you would on a float or a wall decoration it’s rolled and secured, probably by painting the chicken wire with glue or modge podge then sticking the paper in.
old window frame with material behind. Great idea for headboard. Want to do this with one or two of my windows in front bedroom of Lamar house. Paint window frames red and use blue fabrics behind for my red, white and blue color scheme.