I used this artistic license to colorize an image in Photoshop. There's almost nothing you can't do in Photoshop, and there are thousands of tutorials out there. I used one from Phlearn about selecting and replacing colors. It was a chance to review the eyedropper tool and get more familiar with the hue/saturation adjustment layer.
The original image was of frost on a window. To me it suggested something a bit cosmological.