When you’re a designer, you tend to have colloquial names for the art we use on covers, especially when they are in a series. Sometimes they’re innocuously referred to, such as “women in beautiful dresses.” But sometimes, well, we use more caution when referring to them.
If you’ve ever read Dean Wesley Smith’s Thunder Mountain series, you’ll notice an art theme. Horses. Generally, cowboys on horses. But inside the WMG offices, they’re referred to as the horse’s ass series.