I really love writing libraries. Haskell has a type system that supports defining really solid abstractions (I.e. code that doesn't even permit wrong usage). Cr

I really love writing libraries. Haskell has a type system that supports defining really solid abstractions (I.e. code that doesn't even permit wrong usage). Creating APIs like that is extremely satisfying. Maybe take a look on hackage and see if there's something missing that you'd like to see and make it.