Hmm, should make "What a BALLSOME level" sometime, considering there's already "What a carsome level" for L++, featuring the caravan in my avatar 32 times. (In that regard, I'm surprised there's no "What a nessysome level" yet, considering nessy is everywhere...) "Spam, Spam, Spam, Egg and Nessy". "Downwardly mobile car" induces a funny image with me, for some reason...
But as we're on about balls:
Tubular Balls (close enough)
The silence of the balls
The chain with no balls
EDIT: attached is screenshot of carsome level. Should upload all the levels (includes a lot of junk, like this one, so I'm not sure you want to try this after all...)