Thick diagonal line pattern?

I know how to make a one pixel diagonal line pattern to be used as a background fill, but now I want to create a thick backround line, and I can’t get the stupid pattern right (hint, I am not a pattern designer, lol).

Can anyone help me design a pattern that repeats itself to create an effect that looks like the background of the left-side rounded box of this site:
http://www.gaiamobili.com/ On the left side rounded box, where it says GAIA MOBILE, I would like to know how to create a pattern that I could use on a page that is like that…only thicker…know what I mean?

http://www.kirupaforum.com/forums/showthread.php?t=52320&highlight=diagonal+pattern