I think it would look great!

That's what we are planning to do. We're matching the window to the trim, which is the same throughout the house (BM simply white), not the cabinets, which are a grey-undertone white. I've seen pictures where its done well. I also agonized over this. I think its the kind of thing that you notice, but others don't necessarily notice. I also chose white hardware and screen outline for the window, because I wanted the focus to be on the view outside the window, not on the window itself.

thank you for all the feedback so far. I should have clarified that this is not the kitchen but a built in nook for computer and TV. The kitchen is white and the crown molding matches well. This nook if off the kitchen but around a corner so not immediately visible. We talked about not doing the crown molding in that area but we couldn't come up with a good breaking point from the rest of the house. We had talked about taking the white molding across the top of the dark cabinets but I didn't know if that was an acceptable design option. I see PPF has posted a rendering of it and others are suggesting it. Here we are trying it out. This might be my favorite option because of the clean lines, I just couldn't find any picture on line of something like that so i didn't know if it was taboo.

I've read that one before actually when I searched. I guess the question is do you have them painted, then if it doesn't flow or look right, what is the difficulty of painting over the factory paint? And looking to see if someone used that on their kitchen cabinets?