So those of you who don't know what a collective is, it's a group of artists coming together to make a body of work to showcase online, collectively. They include various mediums, as well as often including music and video.
The above links are where I do not go for inspiration quite enough. Incredible work to be found. The best of the best really, so enjoy, and feel free to post up some links to stuff you liked in particular.
I've seen many collectives launched by friends of mine that fell through because the artists weren't motivated, so I've never participated in one myself, but the ones you've posted are stunning. Those are definite examples of collectives at their best. I've only looked at the first two links in depth (still going through them).. but everything I've seen so far is incredible!
I'll have to really sit down and do some research of my own. I'd love to contribute some notable collectives to this thread. There's a great deal of inspiration in those pages.