This coloring page has a very fun and festive atmosphere! For the cake, I would start by coloring the tiers in brown and white polka-dots, yellow and red for the Mickey Mouse heads, orange and white stripes for the second tier and green with white spots for the bottom tier. The presents can be colored in different combinations of green and white polka dot paper, red and white stripes and all the bows can be colored red. For the trees behind the cake, I would go for an orange, yellow and green. Finally, I'd would color the Happy Birthday sign in bright green for a vibrant contrast. With this palette, this coloring page will truly be a celebration!