It's always fun to just sit down for a hour or two open up Zbrush and just doodle whatever comes to mind. I never have a clear goal in site or a specific idea, I see where the stylus takes me.
I've done many more of these doodles, many of which have failed miserably but in doing so It's made me a better artist. I hope a few of these inspire you to keep creating.
Thanks for viewing :)