This is set is wonderful and will be keeping my eye on it waiting for the set to drop in the future!
My 2 cents would be on 2 items.
1. I would love to see banner/header of the Lighthouse lighting up cthulhu be made into a deskmat. I like the pattern in the current deskmat design but would love the option to get a non-patterned version deskmat. The banner seems to be rectangular in shape already like the deskmat and is a good start. I would suggest rounding off the sharp lines that make Cthulhu outline into something smoother to make him seem more "tentacle-y"
2. Also is there a possibility of more novelties? Such novelties can be outlines of other elder gods or outer gods (if not other iconography or objects) in the mythos and can possibly fill up and entire R1 to replace the F-row keys for example. There should be enough gods in the original Lovecraft works to round this list. Hastur, Yog-sothoth, Nyarlathotep and Azathoth to name a few. Hastur in particular even predating Lovecraft. Hastur could be an outline of a hooded person, nyarlathotep could be humanoid with an elongated head, etc. Also the detail may be too fine but it would great to see a necronomicon sigil(however I don't know if the sigil requires permission for use).
Either way I have looking for a lovecraftian set for a while and look very much to supporting this set when it drops.