Paint the Creeper in sky blue, letting some of the lines show a lighter tone. Use lavender to make the Zombie stand out, with a darker green for its eyes and mouth. Adorn the Skeletons with burnt orange, bright yellow and white for their bones. Turn the Spider into an electric purple with an orange outline, perhaps use white for the eyes to give it a nice contrast. With these colors combined, you will have created a vibrant and eye-catching scene.