I've seen Maile Belles do this a lot (and Arielle Gordon as well) and thought I'd try it on my own. As I was testing out the idea, I realized that I needed to place my buttons on a piece of paper that matched the color of the buttons in order to allow the gaps between buttons to go unnoticed. I covered my orange square with Extra Wide Tacky Tape and placed my buttons. Then, I thought, maybe I could fill in the gaps by pouring glitter in instead. Since the tacky tape already covered the area, the glitter sticks like a charm. I like the tiny bit of extra glitz when the light hits it (even if you cant see it well in this picture).