Where Have I Seen His Work?
Lovecraft died young and childless and at least some of his work, if not all, has passed into the public domain. Whatever the case, copyright has not been actively pursued. Consequently one can find his influence in any number of genres from heavy metal and musicals to comic books, miniatures, and soft toys. With the current fashion in all things Lovecraft you can also see a strong showing in the mythology he shared with other writers.
A friend of Lovecraft, Robert E. Howard also died young and childless and much of his work is also considered in the public domain. Howard's Conan the Barbarian might be considered more recognisable than Lovecraft's Cthulhu character because of the popular 80's movies but Lovecraft's work is far more far-reaching. Lovecraft was the pioneer of an entire genre of horror; now called 'cosmicism' (though it has yet to make the Oxford English dictionary).
Lovecraft enjoys strong support in the video game market with games drawing varying levels of inspiration.
The resurging board game market has been quick to draw on Lovecraft's work. Eldritch Horror is one of my favourites. It follows the cult investigation theme of the Cthulhu mythos.
As far as comic books go Hellboy is the most popular to draw from Lovecraft. A movie is currently in development- a reboot borrowing from the B.P.R.D line of comics, that's the 'Bureau of Paranormal Research and Development'.
H. R. Giger is famous for his development of the 'xenomorph' for the Alien movies. Less well known is his drawing of inspiration from Lovecraft. Though Giger also added a strong sexual element which Lovecraft would have strongly disapproved of (he was asexual).
A later scene shows the aforementioned flutes. The name Prometheus itself could be considered a play on Lovecraft's work which is Promethean in nature. No doubt there may be many more references.
Just a brief list as it's so easy to find more in this age of computer wizardry. Lovecraft had a difficult, tenuous beginning but slowly, irreversibly crept into the public consciousness. From Alien to XCOM, t-shirts to teddy bears, he has had an enormous impact on the science-fiction genre and beyond, but how many dare make the jump from t-shirts to books.