I GM Blades in the Dark using Roll20, whether the game is remote or in person. Since there’s no need for encounter maps, I put up District-themed art during the Score, or when the players are spending a while in a particular place.
Sometimes my players need a refresher or are traveling to a new part of the city. In Roll20 chat, I have a macro that throws up a brief description of the district so everyone can review if they like. I use these image headers for each district to make them pop in the chat and to make them easily found when someone is scrolling back to find them.
Preview:
They are all black PNGs with transparency, and can be downloaded or linked to here:
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