(NOTE: Graphics are blown up by 200% using Pixel Resize to make it easier for you guys to see on the monitor)
I took icon 2526 - SPCAMO's Winter M1A1 Abrams from MOBHACK (it's where I do my icon flipthru and viewing, as it's easier than SHPed for quick viewing), and placed it into Paint Shop Pro.
I then created a raster layer above the Abrams icon.
I then used the Icon Palette above to help me as a guide for picking out colors; which I then painted onto the raster layer I created above the M1A1 icon.
I then selected the "Multiply" option for the layer, and then "flattened" all the layers into a single one; and then loaded "JASC_WINSP_ICON_PALETTE" to see how it would look in the game.
Some of my attempts looked good, while others looked like crap.
This method of camouflage won't be as good as doing it by hand, like SPCAMO does; but it's a pretty fast way of rapidly turning out icons and seeing if a paint scheme you saw on the internet is feasible or not in SPCAMO games...