Hi, <imę kolegi>.
It's me, <twoje imię>. I'm writing to you because we didn't met for a long time. Because I know that you like football we can meet in football pitch. Or, if you heve got bad mood, we can go to cinema. I saw advertisment of 2012. It's film about apocalypse that will be in 2012. After that we can go to pub or restaurant for piiza and beer. So what, Can we meet someday?
Write soon! <twoje imię>
P.S: Did you know that i wiil have a cat? It is white and black. His name is puppy! =)