The bird bath takes the textures from smooth stone to represent the stand and bowl.
MrCrayfish showed in a live stream that there is an easter egg with the bird bath. To enable this easter egg, you have to be a donator. When you right click the bird bath, lighting and explosion particles will appear. The lightning will damage you though but is a cool way to prank your friends.
The Bird Bath can be made using the image below as a guide. It requires 5 stone.