Cel shading 2d animation of a fireball in AE

Just playing with native After Effects effects in order to reproduce the trendy "Frame by frame 2D FX with a cel shading look" (generally achieved in drawing manually the frames into Photoshop or Flash).

The cool thing is that it's totally procedural, meaning that you can add this "trail" effect to any shape layer moving in the AE comp space (here i just created a simple circle shape layer, and animated it with a wiggle expression).