Wall shelving can be anything from traditional to way-out: there is probably enough wall shelving ideas to suit just about anybody and any budget. One of my son's favorite wall shelves when he was younger was a Nike 'tick' - a shelf quite literally shaped as a 'tick'. I bought this for him from IKEA - whether these shelves are still available there I don't know, but you can always browse their website to find out. Personally, I have always been a particular fan of glass wall shelving, with one of my favorite designs being supplied by Argos. Basically it is a set of adjustable glass shelves which come flat packed for home assembly. The whole set is 60cm in height and 45cm wide, all held together with a dark wood center piece.
It is described as a Wave 3-Tier Glass Wall Shelving Unit and retails at around $41.00. Of course, if you want to push the boat out, there is the Harmony Wall Panelled Shelving Unit 200 manufactured by Arena Furniture which, at its full retail price, sells at $954.00 or thereabouts. It consists of 9 glass shelves set into three individual shelving tiers. Perhaps I am cynical, but I think a lot of the price relates to the furniture manufacturer's name than the actual worth of the wall shelving unit. You might also be interested in the Alcove Shelving Unit, designed by Terence Conran. The design looks like a pile of open-ended cardboard boxes on top of each other - as I said, I'm cynical - made out of walnut. It is also made in white.
One shelving idea I do like is described as Patent Office Shelving, made by Retrouvius. This is an adjustable shelving system manufactured in cast iron, some provided as single sided and others as double-sided. These shelves retail at around $955.00 so, although they are described as being retail shelving, at that price and given that they are attractive enough, I would use them at home. They would certainly be strong enough to take the weight of most of my books! The Kalusto company sell a good range of attractive shelving, although I certainly would not describe them as being cheap. One wall shelving unit in their range is called the Chicane Wall Hanging Book Shelf, part of the Tonelli Collection. It retails at a cool $1,251.00 - and, when you think these shelves will only take up to 5kg in weight, I think that is a shelf too far!