Color cells of a matrix as in Excel

All,

I frequently make spreadsheets in Excel in which I rank values in columns
by stop-light colors (red is bad, yellow is OK, green is good).

Image and heatmap expect a matrix in which all the data are in the same
scale, but I frequently have different scales in different columns. ie.
Column one runs from 1-10 while column 2 runs from 1-100. I thus need to
define a separate color ramp for each column. In addition, sometimes the
smaller numbers are colored green, while sometimes the larger numbers are
preferred and colored green. I also want to print in each cell the numeric
value, and I need to show row names. A crude example without the color:

RowNames        Col1     Col2
----------------------------------------------
Row1                   1          1
Row2                   5         50
Row3                  7.5       80
Row4                  10        99
......

Is there any R package that can do something similar? Can I create a plot
that is a matrix of rectangles and get color and text that way?

Any help is greatly appreciated.

Thanks,

John

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