I still think it would be most entertaining to lay hands on flags that leftists radicals like, and desecrate them in front of the leftists, just to watch them have a hissy fit.
Flags such as ISIS, the Black Panthers, Black Muslim Movement, Green Anarchist, Feminist Anarchist, Army of the Nation (Palestinian), the Soviet and Chinese flags, Revolutionary Communist Party USA, Saudi Arabia, Iran and North Korea.
You forgot the fag flag with all of the pretty colors.
If you want to piss off the left by burning a flag you forgot the single most effective one: the rainbow flag