I made the boulders and rocks he's made out of less convinient shaped. After all I doubt Fazbear Entertainment would shape stone into this form and then wait for it to grow moss. Instead it's much cheaper and quicker to collect rocks that already have moss grown on them.

Also a fun fact about the official design of Boulder Toy Bonnie:

In his original design he got 4 upper teeth, even though Toy Bonnie only got 2 upper teeth. RWQFSFASXC/Shadow Bonnie however does have 4 upper teeth, meaning this Toy Bonnie skin might be actually a Shadow Bonnie skin.

Maybe this even means that Shadow Bonnie posesses the boulders, that form this Toy Bonnie skin, which could be a hint for Shadow Bonnie in Fnaf 2 posessing Toy Bonnie.