Hey now; Bloodstone isn't a chroma. There are clear differences in the model, and the stone effects are quite different from the ice ones on the base. Plus, i really like Blade Queen Liss. Her Ult and recall effects are really cool.
That said, i'm all for more Liss skins! She's my second favorite mage (after Viktor).
Some Ideas:
"Space Horror" Liss (Terrible name, i know): Play up some kind of H. R. Gieger-esque, surrealistic melding of machine and flesh. Not to be confused with Project/Mecha/Battlecast/etc.
Pool Party Liss: This idea's been floating out there for a while, and i like it. Implemented a bit like a "Beach Party"; Liss has a sun hat and old-fashioned swimwear, the effects are sand-based, and the ult could look like a sand castle.
Historical Royalty Liss: could mean any variant of ancient royalty, as i think any of them could be cool; Pharoah, Jade Empress, French Queen, etc. There's opportunity here!
Patisserie Liss: Similar to Sinful Succulence Morgana; dress her up like a professional cake-maker! If effects are to be added, the ult could look like a cake or something, the Q could be sprinkles, the W could be a ring of frosting with a cartoonish sound effect, maybe the E could be a spatula? Just spitballing here.