I have a bright blue, bright orange, and white S Wizard. Also have a white S ELX. Though I guess the bright orange could blend in with leaves, but it's really really bright so probably not. I specifically requested bright colors when I ordered them.
White is by far my favorite color, easiest to spot on dirt or in the grass or in a forest.
I once had a dark green Valk, that drove me INSANE but it was the only one I had at the time that was the right weight for me.
I really don't understand why innova, gateway, etc. make dark colored discs. Maybe it's because they want us to lose them so we have to buy more