This is really just a bump, since I've never done this before. But, seems like a good way to go. If they're considering your cakes, they must have seen your work before and appreciate you abilities. If they haven't seen your work before, maybe put a little more into it. sounds like a great opportunity! Good luck 
since they will be like desert cakes, i wouldnt make them too fancy. maybe things like coat the sides in nuts or sprinkles, pipe some nice borders (although i dont think you even see much of that on dessert cakes), maybe a chocolate shape, like a squiggle or a circle.
xx
I love the look of a nice homestyle iced cake (lots of waves and ripples in the icing) with some kind of nuts or chocolate shavings or etc on the sides or top. Maybe a border on the bottom but not the top, if homestyle iced.
I always had this thing as a kid that I wanted my cakes to look like the front of a cake mix box. And still to this day I just think that rippled icing looks so inviting! 
you can just grate chocolate, very homestyle, and easy! or use a knife or peeler to run strips off the chocolate. for more professional chocolate curls im sure theres better techniques, and i think theres an article on here too.
xx
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