I've just updated the core HeroMachine 3 app to support a new set of items. They're in the "Background" slot, and the set is named "Cityscapes". Here they are:
The first one is the "Dark Alley" from Replacement Prize List 2. Since I didn't want a whole set of items with just one thing in it, I went ahead and did the rest. Hopefully you'll find them useful when making settings for urban characters.
I've just double-checked and the updates are live. If you don't see the new set in the list, you'll have to flush your cache.