In my opinion, the most original is a picture with friends. I'm also approaching level 600 and I already have one idea. For me this is an original idea. I will add some items and I think it will be great. I would like to share this photo, however, I am a bit lacking up to 600.
But I found some screenshots on Instagram maybe it will move your imagination a bit :)
If I find something interesting, I will add something else :)