what you want to do is rather simple:
1. Create a very small document in photoshop (so that you have )
2. take the line tool with px1 ( you can choose anything you like here, as the space between the lines should be as big as the lines are....so 1px lines should also make 1px spaces)
3. make two diagonal lines that cross eachother in the middle
4. than select all (ctr+click on the layer thumbnail).
5.go to and click
"edit>define pattern"
6.use it by adding a layer on top of the "color layer" and go to:
"edit>fill" and select you defined pattern.
See not that difficult

Have fun!
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