The-Art-Of-Collage (https://www.deviantart.com/the-art-of-collage) has been running an interesting challenge: The Two Piece Exhibition.
The rules are simple: you may use whatever support or background you like. But, only two pieces may be glued to that background. However much of the background remains visible is up to you. Each member may submit up to two pieces to the Two Piece Exhibition.
Apart from causing extreme angst for collagistes (like myself) who battle to restrain themselves and who need to buy glue sticks in bulk (or, if they are digital, need to have at least ten layers in the background before they even start adding semantic elements); the exercise has been an int