Ideas for furniture for Sons big room.

My sons room needs a new bed. We can't afford anything to pricey. He is almost 200 pounds 6 ft and size 14 shoe. I need strong ideas. And any other cool ideas or things you may have done for inside furniture. I have seen the little house type furniture but am looking for precycled or some such ideas? Like pallets or something?

Do you have Freecycle in your area?  Everything there is free, and you can post what you need, too.  It'd be worth the google search.
I too, have a big son that visits - 6'2", 250 lb body builder vegetarian!  We bought a standard twin bed and it's waaay too short for him.  We didn't know they have longer mattresses in twin size.  Anyway, it didn't take too long and he said that it hurt his back, it just wasn't strong enough to hold up to his size (and too cheap to begin with).
Neighbors made bed frames w/ 4x4 posts, and then scrounged 2x material for sides, plywood for the headboard.  It turned out pretty good.  They did some wood burning on the plywood and stained everything.

I have seen some amazing things built using pallet material. including kitchen cabinets.  We had access to oak pallets for a brief period.  There was no way to get the nails out, so we cut that part off and burned it in our wood stove.  Sigh, I wish we could still get them.

I just did a search 'make a bed frame using pallets' - pulled up several results that look promising.  You should be able to find some helpful tips/ inspiring ideas there.  Good luck!

I really like recycling old water bed parts I glean from yard sales and goodwill stores.  They are thick, solid and heavy.  You can rearrange them to soot your needs.  Right now I have a set of the under-bed drawers along one wall in my bedroom, I covered the open drawers with Tongue & Groove pine boards and sat the beautiful king size headboard with mirror on top.  This is my bedroom bookshelf and storage.  I have some more pieces I am going to make a bed out of in the future.  I've collect 3 headboards, 6 drawers, 2 sets of metal rails and 4 sets of 4 x 6 wood rails - good stuff for bed making.

ecopepper, if you're still following this thread, there are a LOT of bed examples in the video I just posted at https://permies.com/permaculture-forums/9929_0/green-building/old-pallets-uses-lots-in-this-video.

Ana White has great, free, and relatively easy to build bed plans.
http://ana-white.com/category/plans/collections/farmhouse-beds

Grab some lumber from your preferred source (reclaimed, your woodlot, depot) and build away!