I have a list of cake flavors and a list of fillings. the customer may choose whatever combination they want. In my brochure I do have a list of "favorites" to give the customer an idea of flavor combinations.
I've rarely made a special request cake flavor. Mainly because I didn't have the time to be playing around with a new recipe.
I made some Rose Water this past week-end .. I have yet to try that on cake as a flavor.
I have a set menu. Its just the basic flavors. As far as fillings, my customers usually ask for buttercream but I would love to learn some new recipes for fillings if any one is nice enough to share with me 
White
Chocolate
Marble
Yellow
Carrot
Lemon
Red Velvet
I have a set menu, but also advertise the abiloty to take special requests. I've had a few really cool requests!
I had one birthday cake order (for an adult) that was an orange-pistachio and they chose cream cheese/BC filling and icing. Since I had a few cake scraps from leveling a layer, I made my own "cake whoopie pie" just to try the combo. It was really good!
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