Trippy Looping Animation - How to?

These animations can be created in AE with some plug-ins. Whether or not they were created in Notch or for that matter any other motion graphics tool/ compositing program is something you would have to ask the original creator. Based on the images one can deduce the following:

• common use of a "chromatic abberation" technique or a plug-in like e.g. GenArts Chroma Blur to generate the rainbow effect
• massive use of vector blurs (CC Vector Blur or similar) and fake motion blur to create the cirrations and smearing
• use of repetition effects like Motion Tile and CC Kaleida for mirroring
• additional glows and blurs

The second image likely uses a particle grid plug-in liek Trapcode Form with its fractal field simply cranked up and moved through the grid, but with a bit of effort similar stuff can be created using Card Dance or other stock AE plug-ins. Again, everything is doable in AE, both with and without extra plug-ins. just depends on how much work you want to invest vs. investing in the plug-ins.

Mylenium