Good Questions: How to Decorate an Attic Living Room?

Joanne sent a good question: My new apartment has the living room located in an old attic bedroom: it's a lovely large space (9' x 14') but it still feels like an old bedroom, and I want to treat it so that it feels less 'bedroomish'.

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What should I do with the short walls on either end of the space (shelves? wallpaper? paint?)? Would a wallpaper treatment on the sloping ceiling be too overwhelming? Is there anything I can do with that doorway (besides removing the door)?

It's a rental, so I can paint/hang drapes, etc, but can't do anything structural. I really love my greens but they clash with the landlord's yellow.

Please share your ideas and suggestions with Joanne...