The main problem is deciding what colors to use. I want the star to appear iridescent like gem and rainbow will be the tail. I just know that the starry gem is going to take a while to do. I will have to build layers to get it how I want it. I am using gouche and acrylic on this ATC. The red and gold are working very well for me. The border will be gold leaf (using a gold leafing pen). I will definitely use those colors on the 3rd ATC I am working on!