While digging through folders on my computer, I found this city design from awhile back. It's got squirrels, pigeons, cars, clouds, and buildings. (Items not to scale! Those would be some terrifying squirrels.) I adapted it into a printable freebie just for fun: a sheet of notepaper and a matching envelope.
Download the printable stationery here. Then open the two-page PDF and print out the page(s) you need. For personal use only.