Use shimmer paper and inks to make a rainbow shimmer paper. I apologize for the poor image quality and missing part of the recording. However, I think you can still get the idea for the card and decide if you like the technique :)
by Fowmi's Art and Craft
by Steve Harpster
by Firecracker Scarf
by UV Art
by The Crazy Sketcher
by Aurora ArtsandCrafts
by SewWithAby