I liked the rainbow colors and also how they were somewhat muted with the addition of the black in this image here.
Die cut a rectangle, masked for my moon, and sponged the bg. I love how the addition of the black mutes the colors. Removed the mask, added a bit of shadowing on the moon with gray, then stamped my new Gina K Designs image (love this!), splattered the bg with water, blotted with paper towel, splattered white acrylic paint and then some diluted black for more interest. Matted this panel, attached to card front and stamped sentiment.