Setting Fill color for Textboxes

I have the code below to set the color for my text boxes, but my problem is that I can't find the right code for what I want for my SchemeColor. I've looked online at all the listings of colors in Excel (including here: http://dmcritchie.mvps.org/excel/colors.htm), and the codes don't match up with my experience. For instance, light gray is supposed to be 15, but when I replace 1 with 15, my textboxes turn aqua. The closest I've come is by putting 1, and I've ascertained that there are 80 possible values, but trial and error is no way to find the right code. What I want is a very light gray, say 5% gray, just enough to stand out from the white background. Any help on this is greatly appreciated.

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