Design challange

Okay so we decided that as long as we are spending lots of money on carpet that we may as well spend a little more on paint and make things really nice. So here is my design dilemma. I live in a basement so I am a little bit afraid of dark colors because my house is already dark and had awful lighting. In my room I am doing a very light peachy color and then a olive color on one wall, sort of as a headboard since we don't have one. The kids room is going to be split...so one side will be grey with batman symbols on it for Max's "batman room" and the other side of the room with be purple with different colored flowers on it for Elese. So I can't decide what to do in the kitchen or the front room. I saw a color on The New Adventures of the old Christine that I really liked but I don't dare do the entire room this color. So here are my thoughts. Here are some pictures of what I have to work with. Pardon the mess, my bedroom is currently in the front room because of the stinky carpet.

I'm thinking that the "office" area could be this color. I would paint from our door up to the closet wall on color and then the rest of the room another. Or I could paint fro the door up to the kitchen (just past the picture of Christ on the wall) one color. I'm just not sure if it would look cute. Keep in mind we will have new brown carpet. Anyway I'm kind of playing online with the color but can't find one that looks the same or that I love for a big space. So my question is would it look okay to have that area a different color than the rest or should I just do it all the same? Here is a picture of the door. Should I just do my door? It's a metal door though would that work? I'll go shopping for paint tomorrow so let me know.