Interestingly, this has happened again since then. Glass blowers from Sweden (Orrefors, I believe) went out to Swaziland and taught the peope there to blow glass using recycled glass bottles. The children were paid a very small amout for each bottle they brought in, and so there were less glass bottles lying around in the sunshine, potentially causing bush fires, and the streets were clear of litter.
The Glassblowing company is called Ngwenya glass and there is a website showing all the wonderful glass they make.