What was the first MD5 collision ever constructed? We all know that MD5's collision resistance is severly broken.

But when thinking of "random" strings with great cryptographic importance I've come up with NIST's curve seeds and MD5 collisions. But for this to really work out I'd need the most famous MD5 collision.

So I'm asking: What is the most famous MD5 collision?

As for the definition of famous: The very first published MD5 collision is considered "the most famous" with the only exception of one collision having occured a lot more often and having spread a lot more due to important historical events (Flame?) and being generally considered the most famous one.
Even though Dobbertin could not provide a real collision of MD5, I would say that Hans Dobbertin first publicly described MD5 collision(s) in "The Status of MD5 After a Recent Attack" (PDF) – that was in 1996. To the best of my knowledge he was one of the first who recommended to no longer use MD5 when collision-resistance is needed/expected/required.

On the other hand, the most famous is probably described by Xiaoyun Wang and Hongbo Yu in their paper called "How to Break MD5 and Other Hash Functions" (PDF) (Advances in Cryptology – Lecture Notes in Computer Science 3494. pp. 19–35.) which was published somewhere around 2004/2005 and the spear-head of dozens of alike papers which successively described optimized and related collision-attacks.

When you check their paper, you’ll quickly notice (page 1) that they also reference Dobbertin, which is why I think he should at least be mentioned in this context. His contribution provided the base.

From the paper by Wang and Yu: