Don't buy crappy souvenirs to remember your trip, make your own!
Step 1: Go on a Trip
Collect some sand. I went on a 5 week road trip across about 40 percent of my country to collect my sand.
You don't have to try so hard. Sand can be dyed with food colouring or you can use 'decorator sand' (the type they put in candle holders).
Also, buy two photo frames while you're out. Here I used 8" by 10".