Here is what I did:
I used Dutch Boy Lamb's Wool Pant (It is a warm white color), My Purdy Brush and my Rockler Bench Cookies with Cones to paint over my surface to give me a nice canvas.
I wanted to have a mat look so, I marked off my lines with painter's tape.
To help seal out the other color from getting under the painter's tape I painted over the edges of the tape with my background paint.
To create my art I poured my green color (the same color as the wall) on a plate along with some white. I then created an Ombre` effect by gradually added white to the green as I worked my way down the side. I also wanted the texture of the circles so I used thick amounts of paint and swirled the brush.
I did the same thing with the inside rectangle.
To create the tree I used Elmer's Painter's Markers. The markers give me more control. I made a sketch of what I wanted the tree to look like on paper first and used it as I drew on the tree on. I free-handed the tree. First I drew in the branches
Then, I drew in the leaves (in orange) and acorns (in yellow).
I wanted to make the inside rectangle more contrasting to the mat so I decided to put some stain over the top of that part to make it look darker. I taped paper towels around the edge so that no stain would get on the out side edge.
I created my stain with paint in water (75% water, 25% paint)
I took off the paper towels and let the paint dry.
I used a razor blade to cut around the edge of the painter's tape to get a clean edge.