So I kicked a hole in the wall and I'm going to patch it up...The previous owners left some paint they used for the walls (I don't know when they did it but I've been living here for nearly a year) so if I applied the paint over the patch, would the colors exactly match?
Also, do I NEED to put...
Yes - anything about an environment can change a person. For example, your room color can affect your personality whether you think about it or not. Also, a clean, organized room means a clear mind.