Oh, yes, Houzz is a major eye-candy site (and a potential black hole in terms of time)!
Just the first page is envy-inducing for me.
According to color theorists, cooler (greens, blues, purples) colors and neutrals are more calm-inducing, while warmer colors (yellows, oranges, reds and their variants such as Bunny's salmon) are stimulating. If you want to have lively dinner conversations, paint the room a cherry red. If you want to relax, go for greens and blues.
Personally, for an sewing room, I'd go with a neutral such as taupe, which Bunny chose. It won't clash with any color of fabric and you can add color with accessories.