You'd have to define more when you want to use solar, and how much heating you want. When I've been in Indiana in winter, it was never very sunny.
There are a LOT Of things you *can* do, but solar heating in Indiana would be more of a hobby or experiment, than a efficient and effective choice. But, you CAN do solar WARMING (maybe, 10 degrees) in spring and fall.
As far as dark paint, my experience with that came at the Girl Scout pool at Camp Adahi on Lookout Mountain. I had painted it in white epoxy (it had been dingy plaster, before that) and the girls FROZE in June. The pool was on the mountain, got quite a bit of wind, but had a lot of shade. When I painted it dark navy blue, it raised average temperatures 5 - 7 degrees.
BUT, keep in mind that those seven extra degrees may make your pool feel nasty in August.
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