My mind is drawing an absolute blank. ... I can't think of a single thing to code.
Maybe your subconscious is trying to tell you that now is not a good time to code. We all need occassional downtime. It sounds like you're thinking about filling your downtime with uptime. Resist. Instead, consider spending some time adding to your bag of tricks. Dig through PerlMonks -- there's a lot of really good stuff buried in the archives. Read an advanced Perl book. Or mine for ideas from further afield. Inspiration will return in its own due time.