Lay a small handful of puzzle pieces down on a piece of paper or plastic. Flip all the pieces over so the brown side is facing up.

Then using the sponge paintbrush coat those pieces in brown. Make sure you do not heavily coat them as you do not want to soak the pieces in the paint.

Then on another piece of paper do a few handfuls of puzzle pieces and paint those all green.

After the pieces are mostly dry be sure to move them around a little so they do not stick to the paper/plastic. When they are totally dry, we can move on to gluing them in place. 

Start with the brown to make the trunk of the tree. Lay a few pieces side by side in about the middle bottom of the canvas. Then lay a few above those. I did mine about four or so long. Then layer more brown pieces on top those. I did mine three layers high.

Start layering the green pieces out from the brown to make tree branches and work your way up the canvas. After you have an outline to your liking, you can start layering them on top of each other as you did for the brown. You want little canvas to be showing behind them.

Next, we need to add a touch of white to make it look like it is snow-covered. Or, if you just want a green spruce tree, you can skip the white.

To add the white, dip the end of the sponge brush in white paint. Then blot the brush on a piece of paper until most of the paint is off. Then lightly coat the outer edges and wherever you think a little dab of snow should be. I even added a little to my tree trunk as well.

Allow it to fully dry. Then hang up as wall decor or, use a frame holder to stand it up.