Hello! It has been a long time. We are rubicle.net administrators.
We have released yard-rubicle gem as a part of support activity for Rubicle,
the unofficial Ruby mascot. It is a plugin for YARD.
(YARD is the powerful Ruby documentation tool. Refer: <http://yardoc.org/>)
You can install it by following command.
% gem install yard-rubicle
After installing, if you enable it, Rubicle silhouette appears on background
of generated documents by YARD.
You can get screenshot and basic usage about yard-rubicle on following page:
http://rubicle.net/en/gems.html
Or if you want to know more about Rubicle, the unofficial Ruby mascot, you
can get more information on following website:
http://rubicle.net/en/
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Rubicle is not a software, a mascot from Japan. Rubicle has been born from our
will, "We want a cute mascot for Ruby!" 
You can see the image of Rubicle and get wallpapers of Rubicle from the above
website. If you want to contact, ask something or request your idea to us, Please
send a mail or use the comment form at above webpage.
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We hope that you love Rubicle. Please enjoy!