The room looks great! Awesome idea with the ocean wall, night wall, forest wall, etc. Not too juvenile as long as you keep the items in the room age appropriate, which it looks like you are doing. It's a really cool idea to theme the walls the way you did, I like that!
Questions for you --
Are the kids ever going to be alone in this room? We never left our students alone in our sensory room for safety reasons. (Lights, plugs, CD players, etc.) Also, I put a good deal of my own personal money as well as district money into the items in the sensory room - and I know if students were in there alone, stuff would get destroyed (sometimes not on purpose, just out of curiosity). BUT maybe you have higher functioning (older too) kiddos that understand the purpose of the room is to sit quietly/nicely and enjoy the sensory input. The only reason I mention this is because my students were HUGE sensory seekers, but also very severe in their disabilities and would be most likely to injure themselves or destroy property if in the room alone. Just a thought!
We looked into having a glass window put in the door of the room so that the teachers could monitor the student in there - but the district denied the request due to finances
OH - what is the ceiling like in the room? I found an AWESOME swing from IKEA (it totally looks like a "special needs swing" - something you'd see in Abilitations or something for several hundred dollars... but it's $34.99! Can you believe it? If you were allowed to install a swing (you have to have a ... beam in the ceiling or something? I'd ask your janitor/administration....) but if you were allowed to -- swings offer great sensory input. A swing is also age appropriate, I think - you're never too old for a swing! The swing is blue stretchy fabric type material and hangs from above, you can wrap yourself in it. There's a seat that you sit on... that's about all I can explain. I looked for it on the IKEA website - but couldn't find it. They have some products that are only available in the store... and I'm guessing this is one of them.
A few other "cheap" ideas to add to it as you move along in the progress of creating the room:
Bubble wrap (kids love this)
Fabric from the fabric store - pick out random pieces from the "discount bin" -- I can usually get pieces for 10 cents/piece -- you can get fleece, polyester, fuzzy, rubber feeling, etc. I made a little "quilt" with them (nothing intense, just stitched many pieces together... it's very sensory oriented because the kids move their hands from one piece to the next, can lay under it, can sit on it, can look at it, etc.)
Shaving Cream (this may be something you want to "keep out of the sensory room" if you're worried about kids who make messes... but we had a small plastic bin with several squishey balls (washable) in it, and would squirt the shaving cream into it and the kids could move their hands around in it... this might be too babyish?? But shaving cream is a favorite among my kids.
Shredded paper! a bin full of shredded paper is fun to touch, feel, look at. (get this for free from your office or special ed office!)
The room is really looking great - the kids are lucky to have someone who recognizes that sensory input is SO VERY important for ALL kids!
Keep us posted on the continued progress you make with this room! It really looks great and you're doing a great job with it.