Disclaimer:  I began collaging for myself, never expecting any of my creations to become public.  I've liberally made use of amazing images - graphics, photographs and photographs of art pieces.  I incorporate them into a completely new work, but it would be polite to check with the creators.  I would like to start acknowledging those pieces whenever possible.  If you recognize a piece of your artwork in one of mine, please accept my gratitude, my apologies, and let me know so I can acknowledge you!