Well I think I can say that I have all the fabric I need for Bonnie's Mystery!
She said a wide variety of neutrals was needed so I had to go through my stash again and pick out almost anything with a white or cream background.
Bonnie's example on her blog had a very varied mix of fabrics.
Bonnie's other colours are pink (which I'm also using)
Green (I'm using Aqua)
Brown (I'm using purple)
And a constant red fabric (I'm using 2 greens instead).