Fabric is one of the easiest ways of getting the feel of a professionally designed interior. Upholstery can be a quick way of adding interest in a room. Look to invest in a good accent chair for your child's room. Besides a bed, and a chest of drawers and a nice toy box, a really good looking chair can transition your child through several years. Consider shopping around for a second hand vintage french chair for a girls room, and something more modern for a boys room. Choose something you will be thrilled with. Amazon has a number of wonderful fabrics to choose from. Living in DC, and then Seattle, I am constantly on the look out for good looking fabric, and often times I don't find the right style. Amazon is always surprising me with the good looking products they carry. When you do choose the right fabric that will work in your child's room, and have found the right accent chair, consider painting the frame a coordinating color. A cornflower blue gloss would look dynamite on the canopy french chair above. When working with brighter fabrics, consider a gloss paint for the frame. The frame should be one of the best features of the chair, so giving it it's right place along side the fabric is only fair! The right choice of paint color can really make the chair the statement piece in a room.
I love French furniture, and if you look out on your local craigslist, or ebay, you can find them for very reasonable price points. I have picked up a number of french chairs at 50 dollars, which is very reasonable for a project. While I do my own upholstery, I do suggest that you take it to a professional. Box cushions are rather difficult. I have found that most professional upholsters charge around $300 depending on the business.
If your chair is a simple Louis XV chair, or French Provincial, it can be relatively easy. You will need a electric stapler, which are sold at your local home depot for 50 dollars, and padding where necessarily. Picking out the chair, and the fabric is incredibly fun. I have had so much fun over the years discovering my style, and decorating a kids room lets you go a little wild where you wouldn't for the rest of your house. Have fun!