And let's face it, I'd rather cut my thumbs off than use GIMP.
So I made this little template in paint.net, which you can get here for free.
Just resize the image you want to turn into a flag to 100x60, then paste it into the layer that says to put the flag in it. Save as .png, then when prompted flatten the image. Voila. A new flag. Then you just paste it into one of the flagbits files, note the location of the flag, then use that number in your .cvp file. Voila. A new flag that looks... well, okay, I know the shading isn't spot on, but it's 'close enough' to not bother me.
Have some examples I've made, though not all were made with this template, as many were made back when I used PSP9 more. I've got Cascadia, Boralia, Gran Colombia and many more flags in there. As always, be sure to back up your stock files before you start modifying them!
