"Varfix" by Kotaro Tanaka

"This music sounds somewhat monophonic, so this video was made such as polyphony in contrast.
Animation can make events not only simple but easy to understand. Each elements used in this video
separate from the meaning which they have originally, they are used for only representing something dynamic."

Michel Gagné's "Sensology"

Sensology was handdrawn (painted) with a Wacon tablet at first, and later, a Cintiq, using Adobe Photoshop. The drawings and frames were then composited and manipulated in a 2D software called Animo. There is no vector animation at any point in the film.

It wasn't done in Flash, but the timin and visual style of the experimental/abstract FX animation are awesome inspiration.