If by "discuss designs and ideas" you mean open conversation about other possible Champions to add to the Dark Star skin line, I have only one: Galio. With his kit, humanoid but distinctly inhuman build, and his filling a role gap (Thresh, Varus, Orianna, and Kha'Zix fill Support, ADC, Mid, and Jungle) and his class as a Warden Tank make him a pretty awesome candidate to join the nihilistic Corruptants.
As for Zed - I could totally see him becoming a Corruptant, too. There's a lot of possibilities for him - his silhouette is simple enough to be molded into a Dark Star skin, his abilities all can be made to fit (Razor Shuriken and Shadow Slash could have whirling, galaxy-esque visuals, Shadow Clones created by Living Shadows and Death Mark could have a spacy quality to them like the Cosmic skins, Contempt for the Weak could have a bubbling dark-matter effect like Dark Star Kha'Zix's Taste Their Fear, and his Death Mark symbol itself could be his Corruptant Sigil (the little glowing rune above the Champion's head))
IMO, Dark Star Zed is an awesome idea, and even better still that it's unventured territory for the Master of Shadows.