This is a little variation of the same method I used to make barbed wires (previously posted in another tutorial).
I used the same mosquito net with a different cut to make a squared zig-zag and lightening decorations.
Such decorations are quite common on ancient buildings, statues basements, shields etc.
It would be very difficult to be made such decorations "freehand", this way make everything much easier.
The effect seem good to me, the look appear quite regular on small scale models, although the result is not perfect due to the upside-down meshwork which is not perfectly flat… and the casting of some pieces was not perfect neither.
The only recommendation concerns the net, it must be welded or casted "all in one", otherwise it would break in pieces once cut in this way.
The rest depends only by the precision of the cuts, and by the precise positioning on the right place of the model, so is good use a good cutter and a glue that allow a a correction of the position if needed.
First I cut a strip of squares from a mosquito net.
Then I cut off the protruding bits, to flat both sides.
Finally I cut off one bit from each side to create alternate zig-zag square decoration.
Here is an example of statue basements where I used this decorations, the statues are conversions of 6 mm figures.
In this other variation I left tiny protruding bits on the final edges, which I cut pointed to make the arrow shape of a lightening top.
This can be useful to recreate the typical lightenings on roman legionaries shields.