Can the headboard be lowered enough to fit on the side wall? It only needs inches. Maybe there are feet on it that could be removed. I hate to see the bed covering the only window letting light into the space. Great potential here, but I would make every effort to get the bed away from the window. Maybe you have a lower headboard that could switch with this one. I think my next step would be to get a rug to anchor the bed, and the colors in it will help determine the direction to go with walls. Paint or wallpaper are usually the last steps in a project so you can base them on the unchangeable fabrics and textiles you've chosen.

That's a good point - I know at my house I want to see out. Maybe you feel that way? Idea with curtain rod: hang bed sheet, etc. over rod. Ruffles - try 2+ sheets?

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What color is certain, as in headboard, flooring? etc...

It will be hard to decorate the sloping walls, so I think I'd find a fun wallpaper for the wall behind the headboard, and then find low cabinets or other useful shelving for the low walls on either side, preferably white so that they don't compete.

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xx'ing my fingers...hope it works. Just saw the picture below and thought of your room - so pretty! They are diy pillows and link is: http://houseandhome.com/easy-diy-trimmed-pillows/

Can the bed be moved with the headboard on the left wall?
This is probably my favorite attic space

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If I were you I would wallpaper from wall to ceiling with some nutty pattern

Reading Maureen's post about painted [color?] furniture I remembered that you said there are trees and not much sunlight -- could be a place for bright color.

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I agree with the comment that you should just put the bed on the left sloping wall and have the bed pulled out a smidge so that the hearboard it hitting the slanting ceiling. The find a modern bedroom picture on houzz that has the feel you are seeking and be guided by items in the room.

One of the best ways is to find your bedding first

This pattern could work with your existing grey walls and accent with dark colors to coordinate with your headboard.

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Again grey and white with one colorful print above bed

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Full on with two tone wallpaper or you can strie the walls or just paint two colors. Again all decor taken from beding. Note glam nightstands and the chandy!

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OR a pair of prints that can be hung on either side of the window for color inspiration

Thank you all so much, this has been soooooo helpful, you can't even imagine. I moved the bed on the left wall, and I actually do like it better there now. I'm going to hunt down another bedspread and rug and then pull the wall color from there. I LOVE Houzz!

Please post the final result here for us to see!

glad we were able to help

I like the med. gray accent wall behind the bed, white trim and add striking, modern or Asian night stands and lamps on either side

2015 Dilemma! As usual, we never got to see the results of our suggestions.