These are my postcards (not all because i'm working on some more at the moment... 

The first row of postcards have been done on photoshop, the second row have been done on Illustrator..(they're not as good because I haven't practiced enough, so they are simple compared to my photoshop stuff.

The Illustrator stuff shows 3D lettering, which is a good effect (took me a while to figure it out..) Different tools have been used (can't remember which ones..)