Plastic is arguably the most common material which defines our modern age. It's not just about recycling unwanted plastic but about using alternatives to gold and silver.
Here are a couple more tutorials using the humble plastic bottle made from PET (polyethlene terephthalate). The Italian site, Craft and Fun, have a couple of easy tutorials on how to cut out and shape with a little heat flowers.
The ring tutorial is essentially for the flower formation using a bit of heat to smooth and warp the plastic pieces. It does not include the wire ring portion. The flower bits can be either wired or beaded together. Your choice! The necklace tutorial shows the design where ball head pins were used to wire the flowers to a neck wire. Again, use your own creativity to incorporate the basic flowers into your designs.