Working in greyscale is an interesting exercise. You can certainly learn a good deal about value this way. I seem to be in a black and white mode these days.
This year's block challenge at
Joseph Schneider Haus in Kitchener was themed "Memories in Black and White" Each year a quilt is made from submitted blocks that will later be raffled as a fundraising project. This is the block I submitted. It is done completely with black, white and grey fabrics. I chose to design and hand applique a block using my version of Forget-Me-Nots.

I made the best use I could with the few prints I had. The "buds"are almost all a bit different even though they came from the same fabric. The main flower's centers were created by being very selective about cutting this Mark Lipinski print. As you can see, I never hesitate to cut holes in the middle of a piece of fabric