Tennis Ball:
Tennis Balls can be found randomly by foraging on any 'artificial' surface.
Swirly Ball:
Swirly Balls can be found randomly by foraging on water, and occasionally on unnatural surfaces.
80's Ball:
80's Balls can be found randomly by foraging on dirt/soil, and occasionally on unnatural surfaces.
Starry Ball:
Starry Balls can be found randomly by foraging on sand, and occasionally on unnatural surfaces.
Happy Ball:
Happy Balls can be found randomly by foraging on grass and occasionally on unnatural surfaces.
Melon Ball:
Melon Balls can be found randomly by foraging on foliage, and occasionally on unnatural surfaces.