I'm helping a friend with some paint color choices, which I'm normally very good at doing. I'm struggling with the last color though. She wants a "hint of blue" color, and says she wants a slight gray undertone. My concern is that her bedroom faces north and I fear anything with that tone will have a dirty/dingy appearance. We don't have time to get samples, so I need to make this decision on the fly. I think it should be a hint of blue with a white base, but can't come up with a color. Any suggestions/thoughts?