"It's a great day to crochet" might be a good one for someone you don't know very well.
For my crocheting friends I would probably be a bit more colorful like, "Hookers do it with one hand" but I don't think your friend's mom would find it funny coming from you.
If you like crochet puns, try this site:
https://cozyvibecrochet.com/crochet-puns-jokes/ Here's one from that link, "Playing hooky today."
You are so kind to reach out to your banker this way!