Every recording I do is an experiment in some way. Still, though I try to fight from using "Auto pilot" in my playing, structuring, arranging material the same way again & again.
The problem becomes the longer you play the harder it becomes to change old habits and find something really new (for you) to play.
Things I have tried-
In arrangement & playing - No structure, no repeating structure, no known pattern playing, using random note choices from unexpected sources, mathematical patterns transfered to bass, imitating vocal patterns, animals & other instruments, Role reversal for the instruments, playing around with how one plays on the beat and cut & paste.
New Pedals & Basses-always stirs something up.
What have you guys experimented with or used to push your creativity?