This is one of the bedrooms, dining room and living room... My oldest daughter is 5 and this would be her bedroom, and my furniture is all light wood and neutral colours really! I'm looking to replace my dining table and chairs.
My daughters bed and furniture are white from GLTC & Next and it's quite new.
I love the windows, is the house 1920s? The floors are nice wood, the bedroom has good carpet but it's all a bit bland. I would be putting in a lot of colour. If you're not used to using bright colours - and you want to use them - start with something like a rug and get used to that then build from there, cushions, curtains, upholstery. Colours don't have to match but it helps if they are a similar tone (so acids, for example, or jewel colours or those that have a greyish tinge).
I put a lot of pictures on the wall - anything will look good in a frame and you can get plain wood/black/white/silver frames incredibly cheaply at Ikea (which also come with mount board which helps make pictures look sharper too) or on ebay. Spend some time grouping things in an interesting combination on the floor or tabletop and then photograph it so you know which picture goes where when you come to hanging.