How to manufacture cheap custom flexible circuit boards? (strips)
There are PCB manufacturers that offer flexible PCBs. However, PCBs which are some meters long will cost a significant amount of money.
You may look into a conductive silver paint (e.g. http://www.maplin.co.uk/p/electrically-conductive-silver-paint-n36ba). With that you can "paint" your electrical traces onto a thin substrate.