I was invited to submit some designs to the Secret 7" initiative for 2016, having had one chosen in the 2015 round, so I sent a few off. Last year there were about 5000 entries, including designs by Yoko Ono, Martin Parr and David Shrigley.
From Secret 7’s website:
“Secret 7” takes 7 tracks from 7 of the best-known musicians around and presses each one 100 times to 7” vinyl. We then invite creatives from around the world to interpret the tracks in their own style for every 7”. 700 sleeves are exhibited and then sold for £50 apiece. You don’t know who created the sleeve, or even which song it’s for, until you have parted with your cash - the secret lies within.”
The sleeves are sold to raise money for a specific charity each year, and anything not sold on the sale day goes to auction on eBay where the price can get much higher than £50.
Here's another one: