PS Publishing will be releasing a new anthology next year, its premise being the auction catalog of the Starry Wisdom cult’s library from 1877.
I’ve written a section on The Book of Dzyan, written in a pre-Blavatsky vein based on Lovecraft’s depiction in his tales as well as material from Joan Stanley’s Ex Libris Miskatonici. There’s a few other people involved you might be interested in as well – Ramsey Campbell, Nick Mamatas, Joe Pulver, and others.
At an earlier stage in the project, I wrote up some real-life grimoires for it in lurid detail as well. I might post some of those entries when the book itself appears.
If you’d like to find out more, see the contributor’s page.