I've spent the last few days trawling through old magazines, especially the American House & Garden magazine from the 1920s.
There are lots of beautiful adverts in these old magazines, from a time when illustration was still the order of the day and photography hadn't taken over.
This one's by an American artist called Pruett Carter:-
Through the little foibles of US copyright law, this one's out of copyright even though Pruett Carter didn't die until 1955 - so it's free to be used in whatever way you like.
I'll dig some more out over the next few days.