I guess, you want to apply it e.g. on "Simplelist" and if you select the filter "Category" you want the search field prepopulated in a dropdown list (as alternative to a free text search).
Currently this is not possible, sorry.
Currently this category coloring of the background - as usable in the "Calendar" - is not applicable to "Simplelist" out of the box.
One could enhance the the PHP code for that - or - use a custom CSS (even that is not that simple, because you would hard code the coloring - then even for the text - for each category and it would fall to the default for new categories).
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