In season 3, episode 17 of Young Justice (titled "First Impression"), several characters appear that have striking similarities to Scooby-Doo characters. The picture above shows characters which look like Fred, Velma and Daphne. There are also characters that look incredibly similar to Sheriff Stone and the fake Mayor Jones from Scooby-Doo! Mystery Incorporated.
There's even a scene in which the Velma look-a-like character loses her glasses!
Here's an excerpt from Greybishop, who came up with the idea for this fun fact!
"An alien attack on Brooklyn, Maine begins by taking a potshot at a police cruiser driven by a Sheriff who looks awfully familiar to anyone who is a fan of the Scooby-Doo Mystery Incorporated cartoon from 2010. He protects a young lady in a smart outfit from harm and then the word goes out and the team of heroes known as The Outsiders shows up. We meet a spectacled young lady with a huge vocabulary and finally a blonde girl in a familiar looking outfit. There's even a scene where three "aliens" are unmasked and turn out to be normal humans. As they're being hauled off to jail, one even says that "We would've scored, big time, if you heroes hadn't gotten in our way!"
I would totally watch an all-girl version of Scooby-Doo similar to the Newsgirl Legion in Young Justice.
For more info and an in-depth comparison by Greybishop, check out his blog here!