You can print out this wonderful set of illustrations by the incredible Brian Kesinger and use them to customize your city-themed See N Say!
Matte finish vinyl sticker paper for laser printers worked very well for me -- I used the "heavy paper" setting in the print dialog to make sure the toner bonded well with the paper.
Print at 100% size, cut carefully with a hobby knife, and peel and stick, being sure to smooth out bubbles as you go.
