Youngblood was already created in the early 1980's they appear as a pin-up in Megaton. It has to be floating around cyberspace somewhere, but I am far to scared to google image search Rob Liefeld "art"

I thought that needed a little change:P
On topic, wasn't there a fake pseudo-Avengers who fought the Justice League in the 1970s? I only dimly recall the issue, but Blue Jay was the Wasp take-off.
Also, in the Civil War Fantastic Four trade, the Thing works with a group of French heroes who are obvious parodies/homages to the Justice League.