I painted the hallway blue just for this very purpose, to have white frames and white decor against it. I spray painted a couple wall decors we had on hand and used ribbon I have had for a couple years. By the way, never buy the 1$ spray paint from wally world. It definitely pays more to spend more in that area.
I bought foam board from and cut shapes that I wanted. They come in gigantic pieces so I was able to use one foam board for all these frames. I sanded down and mode-podged the edges and modge-podged the photo onto the board.
So, slowly but surely things are getting put up on our walls and it's feeling more and more like a home!