Generally, I apply the Less is More attitude.
I have these hanging plastic clothes pins on a cart in my cozy room and I find myself gazing at them a lot. I am completely in love with the simplicity of them and their slightly off colour. And I have been delightfully surprised at the many uses I find for them!
Last year my Polish Grandmother got to the point where she couldn't live alone. The whole family went to her house and cleaned it up and out. I brought home a car full of relics (not including the furniture that was later delivered). These clips being among the stuff....best thing was, they were still clipped on their original packaging card. This explains their groovy colour. From the colours and packaging design I would say they are from the late 60's or early 70's.