Look around you... What itch do you have? What task is a pain, but you have to do it anyway?

You'd probably get more enjoyment out of using perl to fix some problem you have to deal with everyday than doing some homework assignment we give to you.

If you still want an assignment, tell us what your goals are. I'd be tempted to tell you something like:

  Write a program that will read in a file from a disk,
  sort it (without using the sort() function), and write 
  it back out under a different filename.

  Now rewrite it using OO-style programming techniques.

  Now rewrite it in a functional style.
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if I thought you wanted to learn how to program (see the Tom Christiansen quote in at Why I like functional programming). But that may be inappropriate if that's not what you want to do.

So, what do you want to do?