Fairy lights and photo hooks to brighten up the place.... Gotta remember this for when Emma gets older and wants to hang her pictures up in her room. This is adorable and a great way to not have holey walls! Kinda would like this for Christmas too- you could have all the Christmas photo cards hanging from it!
I'm not big on gallery walls, but I like this idea. Make it a small smattering over a hall table/entryway bench, and fill in spaces with small items/letters instead of just a bunch of similarly-sized frames.