Cobwebs should be gray instead of white

[NJDaeger]

What is the texture you would like added?
N/A

Should this texture be based on an existing block? If so, what block?
Eg. Cobweb

Provide an image reference of the material/texture being used in real life. (More than one, if possible)
N/A

Additional context
We use cobwebs for power lines and smoke. We should probably make the cobweb a gray or dark gray to make it work better in these situations.