I love the background design of the overall page and how it is repeated in the background of your content portion. The background color is a great choice as well.
I think it might help if you could make the title and subtitle of the page, as well as the menu choices pop a little more. Maybe a slightly larger, or even a different font, and bold. On my screen the word 'Recetas' almost blends into the green tomato in the background. Also perhaps add a border to the main portion of your contents to show a clearer division between the main content and the side bars.
Great job!