... like the time CLAMP had Kakyoin lay an egg!
Now that you've (hopefully) finished the Jojo's Bizarre Adventure: Stardust Crusaders anime, you can spot all the many, many references across anime and manga. Part of the reason for those homages is that the series is generally popular, but its popularity across the community of creators also contributes to the quantity.
Beyond incorporating references, a recent example of accomplished manga authors offering a direct tribute in their own is Love Roma's Minoru Toyoda,
ラクガキ。承太郎さんとＤＩＯさん。 pic.twitter.com/YNZiMQf9Kz— とよ田みのる (@poo1007) June 13, 2015
Toyoda's vocal advocates at CLAMP famously shipped Jotaro and Kakyoin in their CLAMP in Wonderland: 1994 Summer doujinshi. The work, published after their '89 professional debut, featured Noriaki laying an egg, which hatches into a mini-Jotaro named Jouta. That character makes an appearance in the CLAMP in Wonderland anime music video.
In honor of the 25th anniversary of Hirohiko Araki's sprawling, still evolving JoJo's Bizarre Adventure manga, Shonen Jump's older audience sibling magazine Ultra Jump has published a special tribute insert in its October 2012 issue. The booklet collects homages from legendary contributors to the Jump family of magazines, such as Dragon Ball's Akira Toriyama and Gate 7's CLAMP.
Issue cover with 8th phase of Jojo's, "JoJoLion":
Some of the tribute to Stardust Crusader's Jotaro (as well as Battle Tendacy's Joseph and Kars)
Akira Akatsuki (Medaka Box)
Kyosuke Usuta (Sexy Commando Gaiden)
Eiichiro Oda (One Piece)
Mitsutoshi Shimabukuro (Toriko)
Akira Toriyama (Dragon Ball)
Yusuke Murata (Eyeshield 21)
Hideaki Sorachi (Gintama)
Kenta Shinohara (Sket Dance)