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Generating themes
The spmenu build script spmenu_make has a theme feature. As the name
implies, this script generates a theme. Specifically it generates a theme from
18 different colors.
Creating a color list is the first step. This can be any file. For this article
we're going to assume the file is ./colors. In there you want to set 18
different colors. The first 16 are going to be set in the same order you set
terminal colors. For the two last colors, color #17 is the foreground color and
color #18 is the background color. Note that colors will be reused.
Now that we have a color list, we can start generating a theme. To do this, run
scripts/spmenu_make theme ./colors where obviously colors is the color list.
This will output directly to standard output, so you may want to redirect this
into a file. For testing, I usually do something like scripts/spmenu_make theme ./colors > scheme && spmenu_test -tm ./scheme.
It should be noted that the script doesn't provide an easy way to move around colors just yet, so it is assumed that you have a basic level of shell scripting knowledge here if you want to do that. If colors are incorrectly defined in your color list, the color will be set to #000000 as a default. Unless #000000 is part of your colorscheme, this is a good indication something is wrong.
Now that we have a proper theme, we can use it. If you're using spmenuify you can simply choose 'Install' and navigate to the scheme you output.