Don’t forget the wide angles! Here’s a snap taken the other day, using my 16mm wide angle on a full-frame camera (so if you have a crop sensor camera such as a D60 or Digital Rebel, to get this you would have to use a 10mm lens):

Can you see I like the diagonals to go  into the corners? That is my preference.

Photography becomes a lot of fun when you start to develop your own preferences.