I'm always so impressed with the great work I see on Codepen and whether I understand the logic behind it, I can always rely on the website's users to inspire me for ideas. Below are 5 awesome ones I couldn't forget from just today.

3 Ball Drop by Chris Ganon

A mesmerising looping / loading animation.
3 Ball Drop

Cool Cloth Concept by Gthibaud

Surprisingly addictive and simple concept with sophisticated canvas logic.
Cool Cloth Concept

Wolfenstein Inspired Old School Labyrinth by Johan Tirholm

Nostalgic value helps with this endless and fun animation.
Wolfenstein Inspired Old School Labyrinth

Mario by Takane Ichinose

The amount of meticulous effort and patience this would have taken humbles impresses me.
Mario

Ridin' Along by McFeders

Basic and makes the list for aesthetics alone.
Ridin' Along