Having just painted my Lt. Titus miniature, I felt I should give the Kill Team: Space Marine 2 Mission Pack a go (free on the GW Community site). It has a slightly altered rules set, and stat cards for three Ultramarines: Titus, Gadriel, and Chairon, plus four Tyranid NPO cards: Tyranid Warrior, Lictor, Termagant, and Hormagaunt. Which I'm going to use in normal Joint Ops Kill team games. It's only one mission, but does have replayability, and will easily altered for more variances. I already have the outlines for a few new missions.
Any game were Lictors are actually scary is a good thing in my book.