ugh, you culd make it, would only take about four seconds
ust an immage than is of a certan width, say 16 pixels, and only one pixel tall, make solid blocks of color bout 4 pixels wide rangeing from very dark grey to white (from left to right),
like this
DDDDMMMMLLLLWWWW
D=dark, M=medium, L=light, W=white
just put that into a simple (8 bit, 256 color, or paletised (all the same thing)) PCX file, doesn't MSpaint save as PCX?, hell if you use the -tgajpg (or whatever) comand line you can probly use a jpg or tga (though that would be quite a waist).
or you know it might be in the media VP.