I'm American which means all my culture, such as it is, is taken from someone else. I'm also of mixed 'race' so I have no idea what types of behavior would be considered 'appropriate' by some other group. That said, I see nothing wrong in general with adopting a custom or practice from someone/somewhere else. I'm Christian but I see nothing wrong with wishing someone of a different belief a Happy Hanukkah/Kwanzaa/Solstice/Winterfair or whatever they celebrate, nor am I upset if someone says Happy Whatever to me.

I've been honored to received your holiday cards and magnets and I treasure them. I think the more respectful 'cultural mining' the better.