4th Grade Warm or Cool Birch Trees Fourth grade has been working hard on their mixed media birch trees, for the past couple of weeks. Here's how we created ours.... First, they had to choose if they were going to do WARM colors (Red, Orange, & Yellow) or if they were going to use COOL colors (blue, purple, and green). Then, they painted their backgrounds with Prang tempera cakes, on 12x18 pieces of 90lb paper. After they finished painting, they could start on their birch trees. we used half of a 12x18 sheet, drew them out with rulers, and traced the bark lines with Sharpie markers. The next class, we finished our trees, cut them out and glued them on! Here's a few working on their birch tree paintings.