More in Decorating
Paint the sheet of MDF to get the gradient "sunset" effect. Paint the top portion one color and the bottom portion black. Dilute some of the paint then blend the top and bottom sections in the middle with the diluted paint. On the sheet of plywood, sketch out a design of a tree (or any other design you might want).
Using a jigsaw, carefully follow your sketch, cutting out the shape drawn on the plywood. Glue the cut shape onto the painted sheet of plywood.