I really like white chocolate, personally. When I use it in buttercream recipes it actually does something opposite of what you might expect. I think it cuts the richness of the buttercream very nicely. You can add it to any frosting recipe, just remember to work backward, adding butter cream to your bowl of melted chocolate, then incorporating the bowl of white chocolate frosting into your larger batch of plain frosting.
....good luck, I'm sure they'll love whatever you do with white chocolate.