My reply would be:
"Thanks for the message. Please send me a link to your website, and some information about what pictures you used, and how long you used them. I will then see what I can do. If you could send me your address as well, then I could mail you a nice surprise as a compensation for your efforts."
He'd then indeed have to call his lawyer pretty soon...
Stupid people...
When I worked for that computer games company, we once had a kid on the hotline who threatened to sue us as the cracked game he downloaded didn't work anymore. He indeed provided us with his address upon request, when we promised him some 'assistance'...
Ideology: The mistaken belief that your beliefs are neither beliefs nor mistaken.