These remind me of Tech Lighting's Soco Modern Socket Pendants. They come in so many different colors and socket styles, and they are very versatile. It's fun to play with different bulb types with them, as well. You can check out these product pages for more information and ideas, or to buy.

Soco Modern Socket Pendant:
http://lightology.com/index.php?module=prod_detail&prod_id=74984

Soco Vintage Socket Pendant:
http://lightology.com/index.php?module=prod_detail&prod_id=75136


Hope this helps! If you'd like some additional assistance, our lighting consultants are experts and can be reached at 866-954-4489.