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Generating themes
As of 05/19/23 spmenu comes with a script called generate-theme.sh. As the name implies, this script generates a theme. Specifically it generates a theme from 18 different colors.
The script is located in scripts/make/ and is not installed with spmenu. This is a separate tool. If you run scripts/make/generate-theme.sh you will immediately get a.. admittedly not that useful listing of arguments as well as how to use it to generate a theme.
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 may be reused.
Now that we have a color list, we can start generating a theme. To do this, run scripts/make/generate-theme.sh -c ./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/make/generate-theme.sh -c ./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.