Yes some of this looks alot like another post, but its not copied...


Create a new 6x6...

Use the magnification tool untill your at max...

Make sure the forground color is black

Click on the pencil tool...

Make an X every other tile...(Make sure brush size is 1)
It should look like this:


Or pretty close...

Now click on the retangle marque tool thing, go to edit>define pattern

Use: Pattern
Opacity (i suggest 20-60%)
Mode: Normal
(Note: If it does not show these settings you have a different version of photoshop )

Now go to your image, Edit> fill, Select your pattern in the square box thingy Opacity 20-60% Then on the layer you put it in(Should be new) Select the opicity to like 30-60% and your done!

Mine looked like this(Of coares its not a real sig, just colored green)




Note**: If you want bigger triangles, Select a bigger sized document.

Sorry about the end result, I didnt think the green would be so bright...