Skylines generates random city names and abstract skylines.
Tap the arrow icon in the bottom right to generate a new name and skyline. Tap the sun/moon to toggle between day and night modes. Tap the info icon in the bottom left to see this information.
City names are randomly generated using Wikipedia's List of national capitals, released under the Creative Commons Attribution-ShareAlike License 3.0.
Skylines are drawn after choosing a random number of buildings and random dimensions for each. Each building is filled with windows that randomly change between grayscale colors.
Check out the site's source on GitHub.