Gallery walls are a great way to incorporate both large and small pieces, as well as other types of wall decor like mirrors, tapestries and textiles, and bits of ephemera.
Leaning mirrors are also great for renters because you don’t have to worry about putting holes in the wall and mounting them. Here are some leaning mirrors I found recently that are seriously gorgeous:
Another way you can do this is by incorporating art ledges in your wall decor! I love this method of displaying art because you can always change the look whenever you feel like it.