I just taped in the pics. I know, the proper method would be to nail tabs to the back, but to be honest, my wife had a hard week at work and I was in a hurry to get them on the wall.

Also note I did not use splines in the corners of these frames. The pictures are mounted to chloroplast and there is no glass, so it's really light. If I ever add glass, it will be easy to add splines later to beef them up.