I used a 6x6 grey/white board tile and painted it with white Gesso to give it some texture as I used a heavy coat. Once dry I sprayed it with Lyndy's Stamp Gang Spray in Azure Blue and Bucanear Blue both of which have Mica content and other colours than blue. You can just see the colours peeking through.
I used this stencil with Dina Wakley Media Line paint in Midnight.
You can just see that I edged the canvass with a background stamp out of ELB 22 from PaperArtsy. I also edged the board with a little French Roast Fresco Acrylic.