Use brush on old fashioned, real white paper to make some more or less straight lines. Scan them in gray or B&W mode on 300 pix/inch resolution.
You should get an image that looks like this:
Now you can simply create brush in 2 steps.
Use Rectangle Marquee tool to make selection. Go to Edit - Define Brush Preset.
New Brush dialog pops out, rename it if you want.
Your new brush in Brush Palette is now available for selection. And, if you need these brushes but don't feel like going through all this, get them for free
