There's also , Nick Bantock, of the Griffin & Sabine books. Epistolary collage! (Sounds like a disease...)

Note the common stamp in the Cornell and the Bantock. Not accidental that the age of collage is also the age of the penny post! (Also the age of wallpaper, the carte de visite, cheap chemical paper, usw...)

Also, un petit leçon de langue: coller, in French, means to glue, paste, or stick. It's often used interchangably with monter -- the root of the French/English word montage.

If you want to know more, read my forthcoming book: Paper! Why It's Awesome and Really Important (Even More Than You Thought You Knew).