ISO: single layer cake

My family is made up of 2 adults who like cakes but find the standard 2-layer 9-inch round cake recipes to be too much cake to eat. I'd like to have a versatile white cake recipe that only makes one 9-inch round layer or an 8-inch square layer. I can always split the single layer and ice it like a standard 2-layer. I'd also appreciate some variations on that recipe to make it into a chocolate, or fruit-flavored or something different from just white cake. Unfortunately, I'm not real imaginative when it comes to cooking so my sweet-tooth would appreciate some help.