I have two boys and as they got older and outgrew their solar system and cars decor, we just painted both their rooms a neutral color, got them comforters and curtains in a plain color (blue, grey, black, etc.) and then let them pick a few posters from allposters.com. Boys are easy! Every couple of years I'd offer new posters, comforters, etc. and usually they'd turn me down.
Saw this room on Pintrest when I was helping my nephew with ideas.
I really like the khaki color with the orange stripe. This one has a baseball comforter but it could go with anything. I just the the stripe adds a lot of interest.
http://media-cache-ec0.pinimg.com/736x/16/d6/76/16d676ed4f24516f83bda9873ed72e88.jpg

Saw this room on Pintrest when I was helping my nephew with ideas.
I really like the khaki color with the orange stripe. This one has a baseball comforter but it could go with anything. I just the the stripe adds a lot of interest.
http://media-cache-ec0.pinimg.com/736x/16/d6/76/16d676ed4f24516f83bda9873ed72e88.jpg
I found a site on line (I forget the name) that had thousands of pictures of bedroom ideas. I just searched for teen boys bedrooms. I had DS look through it with me for 30-45 minutes until we settled on an overall idea.
This is what he settled on:
Beige walls (two shades, but so close it's not real obvious).
Wide-striped bedding in dark blue, light blue and white.
Stainless steel industrial shelves, desk and chair (covered in beige, navy and red fabric).
We added two floating shelves above the desk.
Finished it off with a couple more red accents (bulletin board, pillow, etc).
He filled the wall space with a couple Colts posters.
Pretty easy to pull together once he had narrowed down on the general concept and colors he liked.
DS11 is into guitars and we are planning a room re-do for next summer. It is really hard to find any interesting comforters for boys. Lots of solid neutrals! He has stripes now so I think we're just doing a solid color wall with maybe one wall a different color if he insists. He already has some guitar posters but I'd like to get some hangers for his guitars to display them too.
Does your DS have a hobby or favorite color? I hope to go with a neutral wall color so we can change decorations again without starting over as he gets older.
Well, my DS is now 10 and we did a mini "man cave" when he was 8. We got a full sized loft bed and underneath it set up a futon for the "sofa" / sleep over bed for a friend. He picked out a grayish color for the wall. Hurted my heart to get rid of the Andy's Room cloud motif we copied but took a picture of it blew it up to poster size (18x20) and it proudly sits behind his Toy Story collection. That shelf is his Pixar shelf as he calls it as he's got the cars from cars displayed up there too even lotso...lol! He is a Lego lover so the second shelf is dedicated to his Lego creations but we also did a Lego wall. It's about a 3ftx3ft square we mounted to the wall made of the green base plates glued together and what does not make it into one of the bins go on the wall! But other than that some replica movie posters, a couple of skate boards, oh and a couple of cubed storage ottomans on casters and DS is happy.