The Napkin Look and Feel is a pluggable Java look and feel that looks like it was scrawled on a napkin. You can use it to make provisional work actually look provisonal, or just for fun.
Follow Napkin Look and Feel for Swing
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Very fun L&F & we're still using this in 2018, applying it just to specific modal dialogs before demos, to make crystal clear they're "under development" (and thus far from complete).
has potential, but currently alittle buggy and contains sysouts
It is very good, but it needs some work. I'll be watching for new releases.