Indeed, these are lovely shots. I've travelled down that way myself at this time of year, from Brisbane to Philip Island a few years ago. It was the first time I'd seen fields of canola, and other fields of Patterson's curse.
When I was on a tour in Europe recently, I saw similar bright yellow fields, but the coach wouldn't stop for me to take a few photos. These organised tours are really hopless for photographers.
In Europe, the yellow fields are not strictly canola, but rape seed which is used for bio-fuels. I think Canola is a modification of the rape seed plant.