As OP, I deem this counts. It is called a mushroom cloud after all. But the Michael Jackson and Syd Barrett covers do NOT count as anything other than threadcraps in this thread.
Those two "things" next to the "G" and "D" are mushrooms. Perhaps meant to symbolize genitalia (let's NOT open that can of worms), but still definitely mushrooms. Speaking of symbolism, here are mushrooms symbolizing tuning machines: Time To Get It Together
And this 3-LP set of Kiss' first few albums. Somehow I wonder if all three pics of the atomic bomb are from the same location.^^
Let's only have one example of each record-label-with-mushroom design, to avoid multiple releases with the same artwork. Here's another example of mushroom label art for you: Duster Bennett - Fingertips