Photo collage for under $20!  -black foam core board (2)  -Matte Mod Podge  -Pictures cut 4&quot; x 4&quot; (you could do a different size if wanted)  -double stick tape  -foam brushes  -poster hangers    Allign the pictures how you want them on the foam core. Using double stick tape, attach the photos to the foam core. Mod podge over the entire thing. Let dry. Attach poster hanger things and display! (: