I do not like the rectangular flags, but I don't like the distorted ones either.
Some alternate flags:
- behdad/region-flags - these are the ones I actually use
- madebybowtie/FlagKit
- lipis/flag-icon-css - also in 1x1 (rectangular)
- stevenrskelton/flag-icon - also in 4x3
- kreativekorp/vexillo
- seanherron/Flag-Webicons - files have country names not codes
- tabler/tabler