How do a tile with diagonal lines in Photoshop?
How does one draw a tile with diagonal lines that can seamlessly tiled with Photoshop?
Diagonal lines is definitely something that's a little more painful. But, I would recommend using similar techniques as to tiling photos. By using the offset feature you'll be easily able to tell if it tiles, if not adjust it.
Alternatively, there are some great free resources on the web that will create tiles diagonals for you with a huge level of control, my best recommendation is: http://www.stripegenerator.com/