Use old frames, picture wire, and miniture clothes pins to make these easily changeable collages.
The Best DIY and Decor Place For You: Fun Photo Wall
Create a family photo wall that will grow over time as your family does.
7 Piece Wall Picture Frame Set
I really like this idea: Put a collage of old family photos in a large frame with plenty of white matting around the edges.
Multiple Pictures Frame Collage Frame Multiple by ZimWoodworking
Frame w. wire and mini clothespins to easily rotate pictures (East Coast Creative)
Arranging Multiple Picture Frames on the Wall | mybigfathappylife.com
Rustic Multiple Picture Frame Bahama Blue by shoponelove on Etsy, $40.00
note: use the old window from mike's childhood home and paste old pictures of family members in and around the old home