Coordinating non commercial fabrics

This evening Rayna Gillman posted an interesting problem regarding using hand dyed/printed fabrics together successfully. The post was very timely because I was having just that issue in the past 2 days. I am pretty new to most of these techniques and have a long journey ahead of me exploring all the possibilities, but I realized the problem last night when I started to put together the fabrics I wanted to use in a particular piece. This piece has rules that I cannot change so I am semi limited in what I can use to start with. Our guild is doing a challenge due in mid January of a piece that is 24"square but it has to be predominantly (at least 50%) one color. My luck, they picked black! ( I was sick of black and white this summer.) So that means mostly blacks and greys with accent colors thrown in. I did up some shibori pieces last week using black dye and was pretty happy with the results...... trick turns out to be.. how to use them together. This is what I have come up with. It took me a while to work it out. The rest of it will be applique using orange colors.
When I started putting up some of the other pieces together for another project, it occured to me that this is a mine field. It is much easier being in a quilt shop and matching up patterns and colors. It is not so easy at home with your own creations. Questions come up about how busy you want to make the piece, how to not overwhelm the senses or the other fabrics, and just plain balance questions. This is not so easy.
Thanks Rayna for bringing this up.