A bunch of World flags as sprites; two styles, each with a range of sizes from 16 x 16px up to 64 x 64px
#World Flag Sprites
Basically, the GoSquared flag icon set as sprites.
In other words, two different styles - "flat" and "shiny", each of them available in the following sizes:
In each folder, you'll find some CSS (you may need to change the URL to the image), the sprite itself and an HTML page as a quick & dirty demo.
The flag sprites have all been optimised using OptiPNG.
Here's an example: