Some not so old plastic necklaces

I have a soft spot for plastic! These necklaces are nothing special but I think that they are still great for the summer.

The yellow and green cube necklace seems to be the most recent one. I bought it because I have summer sun dress in the exact same colours.

The clear Lucite one is so much fun! The beads are enormous! I believe it is fairly new because it has a lobster clasp. It will make heads turn - but I am not sure if it is a good thing.

The yellow Lucite necklace seems to be a bit older.

The last necklace is a bit of a mystery to me. There is no clasp to help identifying it. I tested the beads but they are not Bakelite. I don't think that the beads are new but it is possible that someone restrung the beads and , in my humble opinion, didn't even count properly. I have no facts to support this but I think that the beads might be from the 1970's or earlier.

Any comments would be greatly appreciated.

Thanks for looking:)