Oh, man! Colors - AND planning ahead? I think you're asking the wrong guy.
I would have thought a light or pastel blue would go with anything ...
... white might be a safe choice, but you already have several white things ... unless that makes it a theme ...
The part that appeals to me most of what you said was:
>> The bloom colors and patterns vary,
To me that sounds lively, bright and informal, hence good.
I mostly practice cottage gardening, or "chaotic gardening".
If you're very, very generous, you might call my sense for color or artistic matters "primitive". "Non-existent" would be fair, and "eye-wrenching" could not be called slander.
The author of Dilbert was thinking of me when he said that you should never let the software engineer pick the colors for a user interface. "Struck blind" and "vertigo" are common outcomes.
But good luck! Better than asking me would be spin-the-bottle in your garage, and whatever color paint can it points to, try that one.
