I think combing cool and warm tones is challenging and think that is why most of us stick to either warm or cool tones, but if done right it can look great! Without pictures, cant comment, but it sounds nice.

I love warm and cool. I also like contrast though. Most of my warm/cool combos come from cool walls and warm wood work,ie floor colors, and warm wood furniture. I think nature is a mix of warm and cool colors so to me it is a natural progression to use a mix inside too. Good luck. It must be overwhelmingly exciting to be building a whole home from the ground up! Even though it is overwhelming do try to enjoy the process too!

I have gray walls with a golden accent wall, drapes, honey oak floors. I like the contrast and think the gray walls enhance the the golden tones for an overall warm look.

Here is brown, gray and cream...as an example.

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Thank you for the pics, nosoccermom. It helps me to visualize. I'm struggling with it. I know "anything goes" if it's done tastefully but I wonder if I'm not brave enough? I will research to see what pops of color might help meld the contrast. thanks again!!

I've paired grey walls with creams, golds and some Browns and even reds in my house too. (All warm colors). The greys I've used have brown in them too. The only time I see a problem in my house is in photos...sometimes the color looks more blue in my crappy camera photos but IRL they look good. At least in my opinion. I also found quite a few items that tie my choices together, area rugs, pillows, back splash, etc. I love these colors together