1. PAINT A ROOM BLACK
Specifically, your living room. Matte black, even more specifically. There's something so chicly European about this look--especially Carli's version with her stark white moldings and neutral, narrow hardwoods.
For more advice on the nitty gritty, like how to even attempt picking a shade of black (yes that is totally a thing), I trust Design*Sponge implicitly.
2. TRY FLOATING SHELVES
When hanging photos and art from walls starts to feel oh-so-pedestrian, try slotting in a thin shelf for leaning. It honestly seems about 99% easier to build a few shelves than a gallery wall from scratch--no spacing issues and only a few nail holes necessary! Extra points for the added dimension that floating shelves provide. I love how David and Liz's shelves blend into the wall, but a more contrasted shelf might also look cool.
3. HANG A LARGE-FORMAT MAP
Not all of us will be lucky enough to find a vintage map of Detroit in our parent's garage like someone I know, but hey, that's why there are flea markets in this world, right? Extra points if you score one like Jack's with the vintage holder--the kind your teacher had in your second grade classroom! Just be sure you find the right size for your wall.
Etsy has some great vintage maps.
4. CREATE AN ACCENT WALL
Ok, so to be fair, this one requires directions if you're not going to hire a professional (hire a professional!). My best advice here is to pick something that YOU really love. Forget everyone else, except maybe your spouse. Chances are whoever buys your house next will hate your wallpaper and it will be the first thing they replace. So, swing for the fences, and really make your paper pop. I love how Victoria and Joe's living room isn't perfectly matchy matchy, but still fits just right.
For inspiration: Pinterest.
5. USE PEGBOARD, BEAUTIFULLY
Short on space, but not on stuff? Try peg board. It works in so many other rooms besides the garage! Pick a cute color like Courtney, and hang uniform items as evenly spaced as possible.