Collage art has been gaining in popularity lately, with themes varying from pop to vintage. A new site called Kohlage is dedicated to the art form, and is a great resource for showcasing your collage art, finding inspiration in the work of others, and finding tutorials to help you create.
One of the reasons I think more collage art is being done is due to its accessibility. You don't need an art degree to create a collage, and it is a liberating and healthy experience. See works from Kohlage above.
Online Collage Exhibits
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Dismembered Anatomy Illustrations
Hipster Organic Fashion
Funky Fashion Collages
Stripped City Collages