strings + gravel terrain

[casswedson]

long, short worms strings + thread in the table

gravel; it looks derpy in urban environments but in the wild it blends just fine, looks like it would make a great rock flor, and it will I am sure, it looks kinda cute; I think it will do

[John-Candlebury]

Hmm gravel probably deserves being multi tile in the future. Although the sprite works well.