>I could enforce Wingdings being installed on the boxes. *s*

Honestly, who doesn't love Wingdings? :-)

>Using a label got away from some problems of a bmp background, especially on grids that aren't boring grey. Also with the label I can simply set it's color based on the color of the grid. The ColorFactor() udf does this:

I see, I would think that with transparent images you oculd do this too, but I haven't tested it and 'll take your word for it.