Ooh I like the one hung row babophz posted. You could do a few shelves above it too for special occasion dishes, etc. I guess it just depends on how much stuff you need to store. I like the grey and glass idea, although white and glass is probably good to give a little tie back to your kitchen. The problem is that it’s impossible to tell if your wall, rug, and the grey cabinets have the same undertones. If the cabinet undertone is wrong it will throw off your entire room. Can you order just one door to see if it works? I don’t think you need a new rug because if the cabinet color doesn’t work with your rug it also won’t work with your walls.

I think the piece the TV is on would feel more at home in the basement with the chunky coffee table. Your home looks to be more contemporary in style except for the stair railing and the big empty display/bookcase. Do you have the budget to remove the built-in? That would give you some wall space for furniture and art. What is the exterior style of your home? Can you pull off a contemporary interior design and not stray too far from the look of the house outside? I don't think the DR is large enough to add more furniture there. I suggest a great piece of art and a rug that is 36-42" larger than your table top on every side. Pull the same colors into the LR with big art on the wall opposite the FP and above a 3-seat sofa where the built-in is. You can do another rug in the LR that is similar in style and color to the DR rug. For example, here are two navy rugs that could work together. The top one picks up your wall color, and the bottom one picks up on the fireplace stone.

You say this is your "new" home. Is the furniture shown yours of is this an MLS photo? Is that area drywall, plaster or stucco? I would prefer a solid wall there, a new fireplace insert and TV above a credenza on the stairwell wall. Depends on your furniture too. An "L" arrangement with a sofa and two chairs would be the most flexible for you.

Here is the room before construction: the area I am working on now is on the left side of the fireplace you see pictured here. There is now a wall there now and so we are trying to put a built-in there. It doesn't need to match the right but it is better if it complements and considers the right. It is meant to help us store books as we have a lot and no other real bookcase in a pretty large house. your original solution is nice but the wall as built doesn't quite angle as the image you have. That was our original plan but a beam/hvac location has changed possibilities. So the wall on left which angles and has the exit out of the room eventually at the end is not able to achieve what we expected. So i'm trying to get ideas on the best type of bookcase to put on the wall on the left. I think it should complement but doesn't need to mimick the right. We have some unused portions as you noted as well. Here is the shape of the room in full though the angles on left of fireplace are slightly different as built. I do not care about matching the angle on the other side of the doorway. That is not necessary. I just want to make a bookshelf which is useful and attractive in the room and considers the oddities. At this late stage in the construction and renovation which started in april. we will not be moving any more walls. the new wainscotting and soffit are in place and I think we need to work with the angle we have but make the best built-in there.