If there is one area we hope to see Windows Phone grow in 2013 it's in third party accessories. Nokia's Lumia phones have the best chance of that since they're quite pervasive and well known as far as branding.
Redditor l1v32r1d3BmX (catchy name, dear sir!) has serendipitously discovered that those iPhone lens attachments (which work by magnetic adhesion) also happen to work on his Lumia 920. The attachments are made by a few companies--a lot coming from China as cheap knock offs--allow wide-angle and macro enhancements to the built in camera. As it happens to be, the Lumia 920's camera housing is magnetic, which is either due to design or perhaps the optical image stabilization (OIS) setup.
Macro lens on the Lumia 920
That brings us to that question on the tip of your tongue: Yes, OIS still works even with these attachments on and no, there does not seem to be any negative effects from using them.
We'll file these under gimmicky though because although they do work, the quality of the "glass" used will probably not yield fantastic results. But hey, we can think of worse things to drop $18 bucks on, which is the going price on Amazon for a 3-part kit. That kit includes a 180 degree fisheye, macro, wide angle lens and a few adapters.
No worries, here at Windows Phone Central we ordered a kit and will have some results for you hopefully on Sunday. So if you are considering these but want some of our thoughts on the results, tune back and we'll provide some sample photos. In addition, we'll test to see fi they work on other Windows Phones out there too.