I am fairly a beginner quilter, and so far had only made a quilt for my mom. But if I were to make a quilt for someone, I'd check the style they have their homes decorated with and go from there. Generally, I get a feel for their taste, style and colors just remembering how thir homes look like. If it not as obvious, I'd ask them what colors and basic style would they like for a quilt. I agree with the one poster that favorite color may not be necessarily the color you'd like for your bedroom quilt.