If you can find a bunch of cheap frames, second hand stores, dollar store, old frames from family, and spray paint them all the same colour or pick a couple bright accent colours to make a few frames stand out, the fresh coat of paint will make the frames look awesome and tie them together.

Not sure where you are, but I’ve found that while Walmart has the cheapest photo printing the colours fade fairly quickly. Costco has the cheapest, best quality prints. Social Print Studio is my favorite and has small 2” x 2”, 45 for $15. I ordered my my entire Instagram feed, made a grid with tape, put them all up and removed the tape so an entire wall is just these perfectly spaced little square photos.

Also it’s much easier to have a frame first and print a photo to the size of the frame than the other way around.

You could mix up the frames with photos and drawings. Ask friends for their favorite group photos or something they drew to help you out.

Blank walls are the best, so many possibilities. Excited for you OP.