When I see a wall that's hung with different objects, framed or unframed, what I like about it is its fluidity and rule-breaking nature. Just experiment a bit.
I'm always trying to get to a danger point in color, where color either becomes too sweet or it becomes too harsh, it becomes too noisy or too quiet, and at that point I still want the picture to be strong, forceful, and the carrier of everything that a painting has to have: contrast, drama, austerity.