Upholstery and egg crate type foams will not be rigid, and may not be flame retardant. EPS and XPS construction insulation foam are lighter weight, more rigid, and could be covered with batting and fabric. They come in 4'x8' sheets, but can be cut with a utility knife into smaller sizes. They are available from a big box home improvement store like HD or Lowes. Not sure if they are flame retardant. Depending on how large a piece you are mounting, I would think they may be light enough in weight that they could be mounted to the wall with 3M removeable hangers of some sort.

As hatetoshop mentioned , moving the bed to the gap between two window is would be right choice. as in current placement you have windows above your head which does not help for a view and looks odd. you could place double curtain rod or use existing curtain rods and add additional sheer /thin curtains for additional privacy during day as well as light. In future you can add two bedside tables as well and some bedside lamps. In India we are still not used to lower lighting (floor lamps, table lamps with warm day light bulbs) but trust me,it will add new dimension to your bedroom. Also some wall art. example a well framed big size ( 2ft * 3ft) art poster above bed (cheap way to add life (I wont use word "Class" (find it too much)) . Also in future you can think about having a pair of bed sheet (to sleep on ) and bed cover/spread (a good quality cotton one) to cover the mattress during day. And a dhurrie runner would be a good addition as well. All above wont cost too much and maybe little bit investment in quality material can be good as well as u don't have to change these often and can be a long term solution.

First of all, I don't think that furniture is comfortable enough to sit and watch TV, so the TV should be remove from that room, the purple wall paper and the purple furniture is too much, you should consider another color for that wall and the furniture against the wall it doesn't look good. What is that room at the end is kind of dark and I cannot appreciate exactly what is the purpose of that room. I'm a firm believer in skylights, we have skylights in the laundry room, kitchen, living room and office, they make a big difference. (if you cannot have skylights (or tube lights) can lights are a great option. There are a lot of great ideas from everyone. I can't wait to see the after photos.

The room has exquisite bones: the windows, flooring and decorative crown molding. If simplicity is what you want but with a bit more personal taste, I suggest the following: 1) paint the walls white that has a soft, warm undertone such as Benjamin and Moore's moonlight white or Dove. (Or try any good paint store for help on picking the right white color.) Paint the molding a stark white with an egg shell or gloss finish. 2) keep the bed covering as is. I love the warm colors and mixed patterns. If you do want more comfort, yes add a thicker mattress. Can you get a fabric similar for the table top? Or just remove the fabric from the table top, painting or stenciling it with a similar pattern. (see #5 below for where to look for stencils.) 3) Move the table to the head of the bed, add a modern lamp and lots of books or other meaningful, personal items. 4) Add a comfy chair or as suggested above, pile lush floor pillows where the table is, under the window. Use complementing or solid color fabric on the floor pillows or chair. Add a small table with more lighting. (See my most popular post on Floor Pillows. Towards the end you will see examples of suitable floor pillows. Or just do a search here on Houzz and the internet.) 5) Make a dramatic statement above the bed with a very large painting. Select with care based upon your personal taste: abstract, minimal but with a hint or some of the colors found in the bedding fabric. It doesn't have to be centered, a little off centered will do since there appears to already be something on the wall above the bed. Do add a soft art lamp above the painting. (If you don't have money for the painting, purchase a very large canvas, take your time and create it yourself (collage it, play around with paint on paper before adding it to your canvas, stencil it, etc.--but have fun and make it personal) Here's a great place for getting a wide range of designs for stenciling: Cutting Edge Stencils. Note you don't have to take the design all the way to the edge of the canvas! 6) Add a small (wool) flokati rug in front of the bed. Get the kind that comes from Greece, it has long-fibers and a plush pile. These rugs are to die for when it comes to comfort and texture--and they're inexpensive. Take a look and if you like it, be sure to get wool: Flokati Rug.Net. These ideas will give you lots of varying textures to get rid of the boredom; contrasting colors for depth and drama; play up the wonderful architectural elements already found in the room; personalize it with what you love; and still, keep it simple and beautiful. Use soft lighting. Good luck!