I will not say which web search led me to this industrial signage site which sells magnetic letters in bulk, but suffice it to say that they are super cool and I am starting to think of interesting ways to commit terrifying yet probably harmless art projects with them.
You can buy any letter or number you want in any quantity, they come in several colors and you can get them from 1 to 8 inches high.
If only they weren’t so expensive. Hmmm.
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You could….cover your entire car! with Q! Wow!