You can use the colour palette with gradients for maximum results!
For example the following code
#import "@preview/stonewall:0.1.0": flags
#set page(width: 200pt, height: auto, margin: 0pt)
#set text(fill: black, size: 12pt)
#set text(top-edge: "bounds", bottom-edge: "bounds")
#stack(
spacing: 3pt,
..flags.map(((name, preset)) => block(
width: 100%,
height: 20pt,
fill: gradient.linear(..preset),
align(center horizon, smallcaps(name)),
))
)
Displays a stack of all flags with the name on it.
Another example here is all the flags with the name associated with their name, thanks @frozolotl on discord for the code so the name are more readable.