Recently, I got myself a black kite with orange stripes, which we flew together with the black kite with flo-green stripes we already had. They look well when flown together, I think, but I felt more could be done to increase the spectacle. Specifically, both kites could be expanded to a triple-stack by the addition of two entirely black kites. Black tails on the front and back kite, with the middle kite in each stack having either a green or an orange tail. Should look really good in the sky!
Now to be clear, we've never flown two Peter Powell triple-stacks, with tails, together .... It will certainly pose a challenge for us: two triple-stacks means six tails that can get tangled up, with each other or with the many stacking lines!
Each of the stacks on their own look great on the ground as well as in the sky.