Neil Sanders has created some wonderful perpetual animation loops for the Loopdeloop December/January 'Cheese Dreams' animation challenge.
Each month Loopdeloop challenge animators from around the world create looping animations based on a given topic. All of the selected loops are compiled and screened to a live audience at Loop in Melbourne, Australia. During the screening a winner is declared, who enters the hall of fame and has their loop featured throughout the following month.
Here is Neil's 'Mark Making' loop. 'Mark Making' is an experiment in juxtaposing random mark making against carefully composed imagery. Below that we have 'Walk The Walk' featuring a variety of bizarre walk cycles. Right click and turn on loop to watch them forever.