[UI] Create themes for PolyMorph

[Giuseppe Luigi Punzi]

I'm squeezing my mind, searching different ways to get a "native" look
for Squeak.

I tried to install Zurgle, but was unsuccesfully, and, thinking good, I
think could be better to use, something more new like Polymorph.

Watery2, looks good, but could be confusing for Windows Users.

Could be difficult to create a "win/native/normal_grey_and_ugly"
look&feel theme for PolyMorph? There are somebody working, or thinking
in doing it?.

Cheers.