When I recently moved into my new quilt room and was contemplating what color to paint the walls, my first thought was a creamy off white. But in the end, I chose a very soft sage green that I just love! I am so happy I went with a color. Green is very soothing and earthy and visually interesting. But to each his own! I would suggest staying away from trendy colors. Go with something tried and true that will soothe your soul and feed your creative side.
Just another thought -- look in your closet and see what color pops out more than any other. That will tell you what color you gravitate too the most, the one that makes you feel good and happy. Choose a soft shade of that color to paint your quilt room.
Lol, if you look in my closet, there's a lot of black.....