I have gray wisp in our bedroom and throughout the house. Love that color! I have dark brown bedding with seafoam pillows and lamps. Here's a picture although the lighting isn't great.

I also think a rustic red-ish color would look great with it and that's what I plan to do with our living room eventually.

what about a dark warm charcoal color?

I have 4 rooms painted gray wisp. White looks great with it. Other options: Tan/camel, Rusty orange or apple green.