With `grid.arrange` I can arrange multiple `ggplot` figures in a grid to achieve a multi-panel figure by using something like:

    library(ggplot2)
    library(grid)
    library(gridExtra)

generate some ggplot2 plots , then

    plot5 &lt;- grid.arrange(plot4, plot1, heights=c(3/4, 1/4), ncol=1, nrow=2)

How can I obtain an &#39;unbalanced&#39; 2 col layout with one plot in the entire first col and three plots in the second col? 
I toyed with a &#39;grid-of-grids&#39; approach by trying to use `grid.arrange` to plot one grid (e.g. `plot5`, above) against another plot, but obtained:

&gt;Error in arrangeGrob(..., as.table = as.table, clip = clip, main = main,  : 
          input must be grobs!



**Update:**

Thanks for the advice. I will look into `viewports` and `grid`. In the meantime, thanks to @DWin, the `layOut` function in the &#39;wq&#39; package worked very well for the compilation figure in my `Sweave` document:
![enter image description here][1]


**Update 2:**

The `arrangeGrob`command (as suggested by @baptiste) also works well, and seems very intuitive - at least it was easy to alter widths of the two columns. It also has the benefit of not requiring the `wq&#39; package. 

e.g. Here is the code from my Sweave file:


    &lt;&lt;label=fig5plot, echo=F, results=hide&gt;&gt;=
    plot5&lt;-grid.arrange(plot4, arrangeGrob(plot1, plot2, plot3, ncol=1), 
                        ncol=2, widths=c(1,1.2))
    @
    \begin{figure}[]
    	\begin{center}
    &lt;&lt;label=fig5,fig=TRUE,echo=T, width=10,height=12&gt;&gt;=
    &lt;&lt;fig5plot&gt;&gt;
    @
    \end{center}
    \caption{Combined plots using the `arrangeGrob&#39; command.}
    \label{fig:five}
    \end{figure}

which produces the following output:
![enter image description here][2]

BTW, Anyone tell me why the &#39;&gt;NA&#39; appears?

  [1]: http://i.stack.imgur.com/ECZdb.png
  [2]: http://i.stack.imgur.com/043sb.png

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How can I obtain an 'unbalanced' grid of ggplots?