As many of my friends know, I can literally spend hours wandering the shelves of any office supply shop, Home Depot or obscure hardware store mentally cataloging all the fixtures and cool, obscure fasteners in hopes of one day finding a new use for them. I prefer simpler designs that are function-driven; and while it's always nice to have a little doo-dad or embellishment, if the clip doesn't serve a purpose (ie holding paper together)...well, it's not there yet.
I am very proud of the variety of accessories I've managed to work into my own collection...and although I don't have huge manufacturing capabilities, maybe one day I will, and then, I'll design my own metal clip, with an extra little twist.
Anyway, if you are looking to feed your own Paper Clip Addiction, each of these were found nestled quietly within typical office and clip sites...and therefore, they are not that pricey. Office Depot, Staples, and Green Light Office. Remember, the first step to recovery is admitting you're hooked.