Thanks alot ^^ Umm. It's in Adobe photoshop, if you have it.
First open up a new thingy 5x5 pixels and zoom in until it's the closest you can go by pressing "Ctrl" on the left side of your keyboard, then the "+" in the num pad. Afterwards, right click on the paint brush tool and select the pencil tool. Diagonally, starting from the left bottom corner to the right top corner (or reverse-- whichever way you prefer) and then using the pencil, pixel 5 squares. Then press, at the top, "Edit" then "Define Pattern" then "OK" :3 Then, if you right click a layer, Click "Blending Options", check "Pattern Overlay", and the arrow next to the default pattern already there, scroll down to your Diagonal pattern and press okay :]
Sorry, I tend to make things like these unecissarily long ><