Vexillology

Sponsored by DPD?

For real though unless it's both a simple and already recognisable symbol, or doesn't belong on a state or national flag...

There's of course allowances for local culture and history, eg. standards vs flags in Britain & Ireland - Wales is the only one to use their standard rather than flag though, first nations flags being more complex, traditional chinese flags + bhutan having more complex symbols, but taking a complex symbol and reducing it down to something oversimplified breaks both the rules of the symbols being recognisable and of the symbols being conceptually simple - it'd be better to just put a detailed rose, otherwise it just looks like a corporate logo: all you'd be missing is some royalty free corporate nothing music as the national anthem