What I call blendables is a fabric that is not quite solid but doesn't have a print to it either. Think how cement looks, its not a solid grey but a number of colors of grey. What I use for blendables is like the "Mirage" collection from Connecting Threads and another one I just started collecting from Maywood Studios called "Shadow Play". That one is bit more mottled than the Mirage but works very well together. I'm working on Quiltville pattern and started using my Mirage but didn't have enough various colors so picked up some Shadow Play to make up the differences and you really can't see much of a difference.