I put a skull and crossbones symbol on all my discs. If you have one with that, it's mine.
This seems to help in the following ways:
1) My friends get my disc from the basket for me. They instantly know it's my disc from either side. On a long day, I have more energy left on the final hole.
2) I can do "coin tosses" and technically call either side "heads" due to the skull.
3) It works similarly to a curse. People that find them are shown the possible outcome if I find them with my disc. It's fair warning.
4) It actually helps if, say, I'm throwing a green disc in a grassy course. It breaks up the color enough to ease finding it.
5) When my tomahawk hits you in the head, and you look down at the disc, you'll feel a strange sense of having deserved it.
Mainly, any old symbol will at least help with #1 and #4, but to come up with a symbol that carries more usefulness is the trick. That's my tip for the day.
