Take out your Flora and look at the Thorn Stitch.
Latin name: Suo Spinam
Japanese name: ソーンステッチ
Swedish name: Taggsöm
French name: Couchure au point d'épine
You need two threads, one to lay on the surface and another to couch it down, like this:
Then couch it down with a 'cross stitch':
On the Aida sampler I used the same thread, and instead of a good contrast I got a nice 'barbed wire'!
will be to add some Thorn Stitch to this sampler, which already feature X-Ray Stitch and Whipped Running Stitch.