Hi everyone 
This is some random shapes i created using only Random Walk Operator. Post-Process was done using Adobe After Effects. Final Color Correction using Magic Bullets Looks v2:
http://www.youtube.com/watch?v=WRGKVTnJRmw [Watch in 720p]
NOTE: YouTube destroyed the quality of video. So i still need to learn the proper compression settings for YouTube uploading.
Screenshots:
I appreciate your comments and feedback!
beautiful 
…what is random walking???and how many particles you used??
Thank you very much…Glad you liked it 
. Random Walk is a operator that comes with Box #3 plugin by Orbaz.
The setup is pretty easy. I will explain how i did the particles in second clip (The greenish nerve like particles which had about 15-20 Million Particles). First i generated the particles (6000 Particles) using Position icon operator and drive them using Random Walk operator. Then i spawned more particles (using Spawn operator) and deleted them over some frames (Delete Operator). Then i used Krakatoa to create 50 partitions and then modified the Colors + Emission using MagmaFlow Editor and rendered with Krakatoa (I saved Emission Channel separately so that i will have more control in Post Process). Then i brought them in Adobe After Effects and did some heavy composting work.
PS: Here is the base particle shape that i worked with.
I like very much your work especially the last(the blue freaky fractals with dof)…I’m testing walk operator and i find him very simple but powerfull and creative.One Important question…in what format you export your render in AE??by the way congrat. for your work are very creative and beautiful
I used PNG Format with alpha (Maybe you can use OpenEXR format). And note that i used ZDepth Pass from Krakatoa to fake the Depth Of Field effect in After Effects.