Pick a topic, find the subreddit for it. If you don't like the vibe there, make your own subreddit and moderate it -- or offer to help mod the primary and let them know it's because you want to change the vibe -- lots of mods really don't have the time to do a great job.
Go advertise your "just like /r/floobinart but with more zimbledings" sub everywhere to get people to come to it.
Go advertise your "just like /r/floobinart but with more zimbledings" sub everywhere to get people to come to it.