How close can a hardware store get to color matching paint? In other words, if I bring in a sample can they get a close enough color that I can use it on a wall next to the original?

I started remodelling the interior of my house and I really need your advice ! I bought some new furniture and I don't know how to paint the walls of the room in order to match that color with the color of the furniture. The sofa and the armchairs I bought are brown, with white and black stripes... and the rest of the furniture is also a dark brown natural wood color. The only think that is a light color of wood is the floor... So, I was wondering... What color can I use to paint the walls to make all the colors match ? Oh, and one more question... what colors should the curtains be ?

Just had my front bumper painted pretty cheap and I realized it is a darker/deeper black then the rest of the car... Is there any way I can easily fix it or make it lighter without getting it repainted?

Here is the situation. My oxygen sensor before the cat converter went bad so I went to autozone and got the bosch premium o2 sensor to replace it. I got the old o2 sensor out easy and screwed the new one in the exhaust manifold but then the plug would not fit into the old plug. I shouldve taken it back out and taken it back, but instead I decided to splice the wires and use the old o2 plug and connect the wires. Now I need help in knowing which colors to connect together. Here are the different colors. Old o2 plug wires: black black blue whire Bosch wire colors: white white gray black I connected the two whites and the two blacks, do they have to go with a certain one? What colors go with what? Please let me know, any help is very very greatly appreciated. I need to get this running good again because I can't keep losing gas mileage from going to work and back because of a bad o2 sensor. To the first answerer: That is why I need to know urgently, because I know it can screw my stuff up.