"...when you're grumpy, your mood tends to elevate when you talk to me about it." Bones' astute observation really seems to get to the heart of what makes a good relationship. When you're upset, does talking to him/her make you feel better? If your answer is yes, keep that person close!
"You are at the end of a beautiful rainbow." Now, okay, I know he went on to mention the little green man and the gold, but just for those few seconds, he was telling her what a treasure she is. And while of course the traditional "what a beautiful view" will never get tired, I thought this was lovely and innovative, even if it was subconscious.
Bones notices which foot Booth leads with when he climbs stairs, and what ear he holds his phone to. That's not the kind of detail one notices about just anyone. The things Bones notices may be particular to her trade - focusing on handedness - but when someone plays a big part in your life, you're bound to notice something about them. Such as, perhaps, "The way you wear your hat/The way you sip your tea..." Anyway, it's always nice to find that someone (stalkers excepted) cares enough about you to notice the little things.
