gridExtra Colour different rows with tableGrob

gridExtra Colour different rows with tableGrob

I have a question regarding tableGrob/grid.table from the gridExtra
package. Using the regular parameter settings, it is straightforward to
colour alternate rows. However, I was hoping that it might be feasible to
get a bit more control over the colouring of the rows. For example, is it
possible to colour every third row in a different colour? I suspect the
grid.edit function is one way to approach this, judging by the example in
this link: http://code.google.com/p/gridextra/wiki/tableGrob but I can't
figure out how to apply that to my question.
I believe the person who posted this question had the same in mind. Table
with rows of different colors with tableGrob
I am currently stuck with R 2.13 due to compatibility issues, so if there
are any suggestions which don't involve later versions that would be
ideal.