I am 58. My name is kim. I live now in Lincoln Nebraska a large city.
Tourist cards are fine.
Animals native to your country or in USA native to the state.
For those in the USA State Capitols.
Outside the USA a card that would show what your country looks like, farms, landscape.
NO RELIGIOUS CARDS, NO ADVERTISEMENT CARDS. ALSO NO CARDS YOU PRINT YOURSELF UNLESS WHAT YOU PRINT IS A PHOTO.
Night time Postcards
Clothing Native to your country
USA historical postcards
Civil war USA
For those in other countries please print something in your native language with english translation.
Trains or subways
Sunrises or Sunsets
If nothing I listed you can find then check out my favorites that should give you an idea.