Hi pankaj. Some lovely ideas above. Is that a door at the end of the passage? It strikes me, especially if you want to make the passage all white, that you might be able to give that door a special treatment to bring some drama to the end of the passage. That draws the attention to the door and away from the passage itself. You could just paint it a vivid colour. I think we tend to let our interior doors remain very plain and boring, when there is no good reason for that to be a rule. The one below would need some sort of backing for privacy, I guess, but I think to put metalwork on a door is a great idea that you could adapt in various ways. (Be aware of the dusting, though! Outside the rain will wash things clean, but not inside.) Also have a look at http://www.lushome.com/11-door-decorating-ideas-create-modern-interior-doors/58940 for some creative paint ideas -- I can't get those pictures to copy. I like the first one on that site. It's simple and geometric, and could very easily be adapted without hurting the budget.

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.

Thank you Groveraxle for the virtual ! you are too good a designer that is why I cannot help troubling you ;) you have your biggest fan in me ever since your first advice:)) As for an in-house designer I am certainly going to call somebody soon . Just that I get such a lot of options and great advice from highly accomplished and talented Houzz designers ..I would be better prepared after these conversations ..please forgive me for pestering you guys like this:)

You list is all "stone" products. Stone products are natural. The durability is guaranteed with stone. Stain resistant...remove marble and granite from your list. Both can stain and etch and both will do this with "flooring" more than they will with a counter top. Gloss levels all change...but it will take years to do it. All stones have maintenance = homeowner needs to work at keeping stone looking good. Stone = expensive. There is no "benefit" for "reasonable" when working with stone. They all cost plenty of money. Stone is expensive. No way around it. If you want "glossy" that doesn't stain for a "good price" then you have forgotten to mention the BEST option: porcelain tiles. Porcelain will do everything you want for a lower price. Stone is expensive, it can stain (especially "oil" stains) it will "etch" or lose gloss level with certain liquids (acid based liquids will do this) and they all need to be maintained and eventually need repolishing to maintain "gloss". Durable is all you can expect out of stone. The rest of your wish list belongs with porcelain tiles.