Thank you! :) It’s not something I’m actively working on, as I find that most spells are very specific to their scenarios. But I might create a selection of generic rituals (summon, banish) for reference on the website.
If you’re looking for spell ideas, I can recommend Cthulhu Eternal, Rats in the Walls and Nemesis which you can find online for free, or Call of Cthulhu’s Keeper Rulebook and The Grand Grimoire of Cthulhu Mythos Magic.