The best way to do that would be to sit down and just write something fun in Haskell. I think the Write Yourself a Scheme in 48 Hours tutorial[1] is a good place to start. While I'm not sure it has the best code style, it's probably the easiest way to get yourself into the Haskell mindset.

[1]: http://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_H...