Hi. Since you have such contemporary lines with the linear use of windows, I think your look is contemporary, but with so many windows, you still want a connection to the outdoors. My suggestion depends on whether you want to blend in with your surroundings, or make a statement. If you want to make a statement, I'd stay with a stark white, to contrast the sharp blue. Then use bluestone cut in a random pattern, to play off the blue roof, but keep an organic feel with the movement of the stone. If you want to blend in more with your area, then go with a mid-range gray color on the walls. It will tone down the contrast, and still stay contemporary. Not a dark charcoal, but not a dove gray. I attached a Gibraltar Gray from Lowes, or you might like a little lighter gray. Benjamin Moore has a bit softer gray: Cape May Cobblestone. Good luck! Please post your choices.

Sounds to me like you might need an architect. DIY design sounds like a bad idea in this case. If I was an owner I would want a pro involved.

If you keep the red roof, a creamy yellow base would look good: ro a tan: You could co in the other direction with a olive brown: Or a dark gray like this brick home: What are the colors of nearby homes?

Hello aju007, Be certain that the structure is sound prior to placing anything on the roof. After that has been determined, you might think about using it for either a deck with cozy chairs and table or a garden area. A few Houzz examples: Best of luck and please let us know if we can be of additional assistance, Elizabeth Cabell, ASID, CID Cabell Design Studio