This trim is called a 'mitred return' in terms of stair building. These are made by the same person who makes the treads either on site in pieces then installed or milled up as one piece treads. You can make them by routing the profile then cut to size on mitre/table saw.

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.

Yes, the easiest way is to use the same paint color on the ceiling as the trim. However, the sheen for the ceiling should be flat while trim is better in a semi-gloss

I would first remove the furniture that isn't staying. It is usually easier to envision a room with fewer distractions. Wait on the nightstand and lamp until the new bed is in situ because size/height matters. Hard to rec dressers without knowing a bit more about your style. Do you want this room to be glam,contemporary,trad??? Are you into mixing woods? Any inspo pics? After the room is clear, please post pics from a few more angles along with the room's dimensions.. You will get more and better advice:-)