Perfection is a concept which is far too abstract for anyone to strive for. Perfection is completely impossible to obtain, because it's a relative thing and we can't even define this word. But we should always tend to something better because we can only perceive changes (in our homes). That's why we shouldn't be afraid to try new things, new colors,new accessories etc.
It's ok to mismatch, the most important thing is to feel comfortable at home.