If my memory serves me, Genestealer Cults were the original Tyranids spawning (pun intended) directly from their premier in Space Hulk.
Double post
Last edited by Julián Lara Vega; 05-06-2014 at 10:02 AM. Reason: double post
If memory serves they even had a Khorne army list in Ere We Go.
Here you have some rules. It doesn't include points costs, but you can figure it out. In my club, we made it into two dataslates (non-compulsory troops for IG-AM and Nids). Enjoy. [url]https://vk.com/doc4562721_190608219[/url]
In a Ciphas Cain novel, there were orc behaving oddly and were functionally a genestealer cult.
In 942.M41 Cain and the Valhallan 597th were tasked with suppressing an Ork outbreak on Nusquam Fundumentibus, a remote Ice World outside of major Warp routes, where Cain had been on a mission two standard decades earlier. While pursuing the action against the Orks, Cain discovered the presence of a Tyranid swarm that had been hibernating for millennia (likely since pre-Imperial times) in the planet's permafrost, carried over by a crashed Hive Ship. The swarm was partially awakened by the action on the planet, but the Hive Mind was destroyed before it could become fully operational, largely due to Cain's efforts
His first taste of battle was on the world of Desolatia, where the regiment had been defending against Orks, but soon they were faced with a Tyranid splinter Hive Fleet, which they held out against until an Imperial fleet arrived to pick up the Imperial forces on the planet.
[url]http://warhammer40k.wikia.com/wiki/Ciaphas_Cain[/url]