Hi All.
Feel silly really but I was experimenting with different methods
last night with all the tools in the drop down.
I came across a brush/tool that enabled me to draw along making
a pattern like a chain link fence / fishing net / diamond effect.
Problem is it was late last night and after several hours messing, I just can't get back to what it
was. Any help would be greatly appreciated. Sorry for being a pain.

The sketch brush maybe?

I hate losing brushes.

There's a brush history docker, that might help...