Look what I discovered in my quest to find cool Rosh HaShanah cards. The "New Year Girl" collection from tastemaking stationary designer Bonnie Marcus (formerly a wedding planner and special events coordinator at the 92nd Street Y, thank you very much) is stylish and appropriate, and includes both modern and traditional elements.
The funny thing is, I discovered Miss Marcus through a rather unlikely source–namely, an etiquette blog written by one "Annabel Manners," a "displaced debutante" WASP in Los Angeles. This southern belle from South Carolina (I think?) claims to be "learning all kinds of interesting things" in her current city of Los Angeles. For example, Jews have their own New Year, which happens in Autumn.
She explains that when she first saw the card, it really "threw her for a loop." Despite a bit of confusion about the autumn leaves, apples, and honey, she thought the design might be a great choice for "clients who need non-denominational holiday cards." Luckily, she made the Rosh HaShanah discovery before embarrassing herself.
Good luck with the multicultural studies, Miss Manners, and might I add: You'd fit right in at my temple!