Welcome Scarlet! If you got locked out of your home trying to save peony buds, you are in the right place. We chat about peonies all year!

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I think Magical Mystery Tour looks good with New Millennium. They are next to each other in my garden. My Berry Garcia is in another bed, but the three of them might look nice together.
I think Strawberry Creme Brûlée, Lunar Glow and Strawberry Blonde or Joanna Marlene might look great together too.
Belle Toulousaine is gorgeous, but I can't think of another Itoh that blooms at the same time to combine with it.
Please keep us posted on what you come up with, and of course share lots of photos!