I think this is some kind of cheating, but it stays inside the rules 
10 cubes, 1 plane and 1 material. Plus a bunch of modifiers, custom object properties and collections.
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Would you mind to show some details how you achieved this? Im really curious to learn more about those “tricks”. You never know, when you will need it.
I would also be interested in knowing a little more if you would like.
At present I would not feel able to do that.
I’m currently trying to learn Blender. So some of the things, that I have done, might be over-complicated. If someone finds easier ways, I’m absolutely happy to hear about it 
The cubes have Mirror-, Subdivision- and SimpleDeform-Modifiers, to shape and multiply them as needed. The whole plant is in a collection, that produces the other flowers as collection-instances.
The object custom properties “hue”, “mix” and “value” are used to control the shader. With 0-mix the object directly gets the hue from the custom property. With a higher mix the final hue value depends from the object-location. The SquareRoot- and Substract-Node have no special meaning. I have just combined some operations until I was satisfied with the resulting colors. The custom property “value” controls the brightness.
The attached file is for Blender 4.2.4.
Greetings
Thomas
10_cubes_pretty_plants.blend (1.1 MB)
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Thank you very much for all these explanations and sharing the database that I just loaded (I’ll have to update my version of Blender 
). I will study this carefully. Thanks again.
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You’re welcome
If you have further questions or some good hints for optimization, I’m happy to hear from you.
Greetings
Thomas
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Driving the color by the objects position is a super cool idea! I will definitely dive into this - thanks!
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