Why not use some of her art work on the walls, in different size and style frames (natural, black, white & silver) - you can pick up some cheap frames in the op shop and the bargain stores - just buy some spray paint, and have fun - let your artist help....... you can even photograph some of her art work and have it blown up to poster size - the brighter the better. I'd suggest painting the walls white, with maybe a feature wall a timber bed head - one with a book shelf would be great - a double of course - the room is big enough. A rug to anchor the bed and some funky cushions. An Eames DSW white retro chair and a small white desk with some floating white shelves for odds and ends.... I'd probably get a white roller blind for the window, and paint the door, wardrobe doors and skirtings white, and a lovely large retro style light fitting in the middle of the room, or a hanging pendant next to the bed. A small bedside table - try Ikea - they have a great range, and not too expensive, you may even be able to get a great bedhead there - she sounds a very practical girl, so no frills. You want a young, fresh, modern look. Place the artwork randomly, in groups, on the walls - hang paper cut outs on the walls with blue tack, to see the effect, before you put up the art - Your artist could help with that too. What's her favourite colour??? Does she have any hobbies?? We need photos and more info.... What a lovely step dad you are!!! Good luck. I hope I've helped...

I think you need to soften the look and colour of the bed by mixing white and cream bed linen maybe with a little soft grey accents. I would go for a variety of textures in the textile as apposed to any outrageous colour and layer the look with throws and cushions. A mirror long and sleek would look great behind bed and a tall floor lamp and some greenery eg: potted palm in the corner by the window. Good Luck!

Thanks everyone who offered advice. I've attached 2 pics of the almost finished project. Can't show the bed as the picture isn't up yet - my partner went to clean some mildew off the ceiling, didn't secure the A frame ladder and only wearing thongs almost severed his big toe when it collapsed underneath him. So a warning to all! Please don't get up ladders that have not been locked or wear unsafe footwear. The mirror and rug were from Gumtree and I made the curtains myself (thank you Spotlight for a sale on curtain fabric). We're very happy with the results (apart from the hospital visit involved). Statement light fitting also needed at some point.

Thanks Lesley, I appreciate your advice. I've done that which is why I think it will throw turquoise. Might go back to the paint shop and look at more samples today. I find choosing colours to be quite difficult - can't easily redo it if I don't like it as i pay a painter - DIY is getting a bit beyond me. :)