This script creates escaping lines from any point. It's similar in function to the built-in Line-Nova Script, but much more flexible. So you can chose the center, the thickness, the angle, the length, the offset and the randomness.
Copy it into the scripts folder from GIMP, you will find it then under Filters -> Render -> Escape Lines.
Example here:

Update1: triangle_array problem fixed.
Update2: Three new offset possibilities: It's now possible to move the center and to add an angular offset. See here.