I can have any postcard, however -
Anything related to transportation, especially trains/railways;
... and many more!
Or you can see my favorite list to get some idea.
PS: If convenient, please let your friends/family/etc sign the card, the more signatures the merrier! However this is not a 'requirement' so it is completely fine to do without this.
About the name: It is not my real name; however, it is a nickname which I hold dearly.