Is there tossed salad on Uranus?
The Great Dark Spot on Uranus appears and disappears.
http://www.solarsystem.org.uk/neptune/
"Although similar in many ways, the Great Dark Spot seems to have been formed much deeper in the atmosphere than Jupiter’s blemish. The Dark Spot was thought to be a long-term feature, but observations by Voyager 2 and the Hubble space telescope showed the marking disappear rapidly and then reappear elsewhere. Apparently extremely rapid large-scale changes are common on Neptune."