I've got 2 favorites that come to mind. Both are from my trip to Tokyo in 2015, and both were shot with my cell phone, which was a Samsung Galaxy S3 at the time. The first, Tokyo Tower at night:
You have no idea how difficult it is to force a smart phone out of focus. That was a tough shot to do, but I'm glad it came out the way I wanted! A couple years ago, I had this printed on canvas and then framed. Gave that to my parents for Christmas. They loved it!
The other photo is a zen garden in Kamakura:
Kamakura was once the capital of Japan, and now is occupied by a bunch of active Shinto temples. It sits about 40 minutes by train outside of Tokyo, which is perfect for a day trip. It's a sleepy little town, but my god, did I take a ton of pictures here! This place is awesome and I highly recommend it.
Also, shoutout to @acidyo for the fantastic question!