Yes filled coke bottles are another way forward, how clever of you to suggest it, green roofed too.
https://www.google.co.uk/search?q=f...n-Construction-using-Waste-Plastic%2F;626;470
http://www.instructables.com/id/New-Innovation-in-Construction-using-Waste-Plastic/
Cheers...pinenot
https://www.google.co.uk/search?q=f...n-Construction-using-Waste-Plastic%2F;626;470
http://www.instructables.com/id/New-Innovation-in-Construction-using-Waste-Plastic/
Cheers...pinenot