A Japanese R+D group called Tateyama Kagaku showed at Lux Live 2014 an interesting LED sheet design with a flexible, highly reflective “solder” coating on different substrates.  One of the substrates was a tough woven fabric, which felt very robust.  They also showed the same sheets encapsulated in silicon for a waterproof flexible sheet construction.  Here is their tateyama brochure for posterity.