What are your buildings sided with? I'm sure there is a paint or stain out there that would be no or low maintenance these days. There is a house down the road with a huge shop, 40 x80 ish that's all metal. 10 years ago they painted it a new color to match the cedar siding of the house and it looks great.
I like my outbuildings to match each other, but not the house necessarily.
In fact all of my outbuildings
don't match each other. My equipment shed up front is forest green steel siding, the coop and the horse shelter are barn red (my favorite

) and the dog houses are brown but you can't see them because of the green hops vine covering the dog run.
Someday, not this year I guess, I'll have a hay shed in back and it will be barn red too.
And someday even farther off we hope to reside the house, and I think it will be .... well, I'll decide when it's a sure thing.
I understand how it can bug you to have all the structures a different color.
I think it lends continuity and a kind of visual tidiness to have the outbuildings match.