My LYS owner has a pattern that she has misplaced but says would be great for my Debbie Bliss Chunky yarn. All I know is that it is diagonal and pretty easy.

I can knit, purl, slip, do simple increases and decreases, and the occasional psso. :knitting:

Any ideas?

Here's some. You don't have to add the stripes if not wanted.
Garter stitch
http://www.sunshineknitdesigns.com/new_page_4.htm
http://cris-craft.blogspot.com/2007/01/diagonal-scarf-materials-and-equipment.html
Rib
http://rainydayart.blogspot.com/2007/04/stripey-diagonal-rib-scarf.html