Sometimes spelling custody as custardy is funny in a surreal way, but most of the time it should be avoided.
Custardy
- resembling or having the properties or characteristics of custard
Custody
- the act of keeping safe; care or guardianship of someone or something
- imprisonment (usually before being tried)
My tip: associate custardy with custard and custody with prison.
Hannah McCall 
Now I wish I could come across the former being used in all seriousness in the wrong context
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I have seen it a few times – usually on online forums and comments. Once you start looking, you’ll probably spot it!
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Oh, I’m simply going to have to seek them out.
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He was taken into custody after he threw something that at first sight seemed to be an explosive but on inpection turned out to be a harmless custardy fruit.
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Lol.
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