It is a quill pen and also a white bird feather.

The SBSAR allows the colours of the feather to be changed. The curvature can also be adjusted.

It is important to apply subsurface scattering in the shader. Otherwise, the feather will look like a hard material rather than soft and fluffy texture.

They are old and worn roof tiles. Since the tiles are on the rooftop, it is full of lichen and bird poop.

With the SBSAR file, the amount of tiles, lichen, bird poop, dirty level, damage level can be manipulated.