Anyone can join, with a 50-word vignette in the comments. Your vignette does not have to include the prompt term.
In the open area, the lights, in all their colors, swarmed over the fog there, making the thing look like an opal.
An ugly, cut-rate opal, thought Tristan, bitterly. All cloudy and flawed. The sort of thing that was not set in jewelry but sold in loose handfuls as trinkets.