coolnz.net – Commonwealth flags (bear in mind they once had a Union Jack flag like us).
Most countries have their own grown-up flag now.
There were lots of blue ensigns that looked much like ours (including national and state flags).
A small sample of the many flag changes made. It gives each country their own identity (and makes it much easier to remember who's who). Having a unique flag and anthem is uplifting.
It's time we had our own New Zealand flag. We'd still be in the Commonwealth and monarchy. Note also that there are many countries that include some black in their colourful national flag.