Blue, the neutral paints with a neutral color couch will make the living room look boring. I rent and am not allowed to paint. Our living room is "butter cream" with a brown sectional and chair. I HATE it.
lol @ kitty's butt in the second pic. and.... i think the middle one looks green, and i don't like that. blue... no. so, i'd pick the "tan", even though it looks really yellow to me... could just be the lighting though.
I agree about the middle one blending too much with the couch. The tan looks yellow on my phone. I am assuming it doesn't look that way in person. Otherise I'll look like ketchup and mustard :S if it was yellowy I'd go blue. But if it is really tan then go tan.