First we have Botanical Gardens by Flickr user, gid617. Small, but effective.
And secondly we have Vortex by Flickr user, eiffelben. I found this one particularly captivating by it's the perfect size of fitting into the vignette space (as it's 8x8). It's just so... mesmerizing.
Anywho, two that I thought were neat.
More to come!