Go to Etsy.com. There are many artists there, all over the world, who work with many different materials. :-) Good luck!

Etsy is a fantastic source!! Don't forget the option of making your own wall art. Perhaps you have some favourite travel pics you could enlarge and frame or have printed on canvas? There are photo editing apps that will transform your pic a certain art style for some cool effects. And sometimes, black & white can elevate a good quality phone snapshot. Perhaps she has a favourite artist/photographer/art style who could inspire your project? Let your wife's interests guide you.