My sister was born and raised in India, but I was not. She and her friends often wore hennas to show off their culture. I've always found them very beautiful.

A few days ago, my sister's friend (who is also from India) brought over some ink for making hennas, and asked if I wanted one. I said yes, but now I feel sort of bad because I'm showing off a culture that isn't mine.
I don't want to offend anybody, but my sister and her friend seemed perfectly okay with it.