“I had a little pony,
His coat was dapple grey…”

To make nursery rhymes creepy, usually only a slight wilful misinterpretation is necessary.

An additional leg here or there.
The slight twist that makes the familiar uncanny.

“… I lent him to a lady
To ride a mile away.“
I love spider horse!
:D
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Sleipnir’s younger sister
Heheh
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I wonder how many legs the lady had.
Well now I’m imagining her looking like a jacana carrying its chicks