To pick a wall color, I get every paint swatch that appeals to me and then I stick them up all over the room. One that doesn't look good in one area goes away. When I narrow it down to six or so, I start moving them around together. I will stick them all next to the baseboards, then toss any that don't work there. Next I put them behind the couch with a bit sticking up. Out go the ones that look wrong. Then I move to the drapes or whatever until I am down to about three or so. If I can't choose between those by doing the whole round the room thing again, I go buy the smallest size sample I can and then paint spots all over the room. I look at them at every time of day to get the truest, best choice. It drives my DH crazy, but it works. No one can chose the colors you like except you.