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Emily Hurley AllModern looks like they have some fun pieces that could grow with him. (Ignore the baby items.)

http://www.allmodern.com/keyword.php?keyword=Kids-Furniture&command=dosearch&dept=0

Lumina Pets hi stineransten......in thinking about accessorizing your son's room once completed, I wanted to bring Lumina Pets lamps to your attention...Our range of lamps are the latest and most creative designs in childrens lighting. Whether he is into dogs, teddys, Nemo, or stars.......I guarantee that he will love our lamps.....Please take a moment to check out the whole range at www.luminapets.com

stinerantsen Looks fun and creative thank you

Shawn Lagemann Clean lines say modern, regardless of the manufacturer. You may want to take a look at West Elm. They have many clean line pieces. Regular or platform beds. Mix it up a bit for interest, don't get too matchy matchy. Maybe a locker type storage piece with other clean lined pieces, or another metal type surface. Look at PBTeen for metal and locker pieces or a reclaimed store. You can always refinish a piece with autobody paint that will hold up for years. Modernfabric.com has some great retro fabrics, or the onlinefabricstore.com You are very wise to not make a child room to "little boy" and choose items that will grow with them. They stay small for far too short of a time. I love the lumina pets as an accent lamp.

arflynn Ikea has great kids furniture