The listpages_tbl plugin outputs a table instead of the ordinary
page lists (PageIndex, UpdatedPages, ...). You need to edit its
source to set colours to fit your site layout.
prev << "appearance/listpages_ul"
next >> "appearance/fancy_list_dict"

You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.