If something is splotchier, it has more splotches on it.
Splotchier can make people think of messiness or unevenness.
Examples:
The splotchier painting had more colors on it.
Her dress was splotchier than mine.
The wall was splotchier than the floor.
The splotchier the better, I always say!
The splotchier the cake, the more delicious it looks.
The splotchier the better, that's what I always say!