That completely depends on what you think is a cool area in programming perl.

As I said in this thread, there are a lot of areas to explore:

• OO programming (Moose)
• XS programming (DBI, Tk, Text::CSV_XS)
• GUI programming (Wx, Prima)
• UI programming (Padre)
• (De)parsing (HTML::TreeBuilder, XML::Parser)
• ...

The next step is to decide if you want to revive a (nearly) dead project that is worth reviving, or that you want to participate in a lively project. Find the source repository for the projects you like and check the commit history for the last 6 month. Find their TODO lists and see if that is what you can help with.