knitting a tiolet tank cover.

looking for pattern.

I couldn’t find a specific pattern but I wonder if you could modify a pattern for a box?
http://www.ravelry.com/patterns/search#view=captioned_thumbs&page=1&craft=knitting&query=box%20cover&sort=best

Found a few patterns.


ETA: Just realized you said tank cover. I guess the box idea might be your best bet.