If your nervous about playing with the CSS here’s an easy fix. Example if you want the default Green to be White then change the files names in the plugins directory:
wp-content/plugins/pixopoint-menu/images
e.g.
First make a backup of the images folder
rename dazzle_white.png to dazzle_green.png
rename smoothfade_palewhite.png to smoothfade_palegreen.png
rename suckerfish_white.png to suckerfish_green.png
rename suckerfish_white_left.png to suckerfish_green_left.png
Rename all ‘white’ files to ‘green’
This tricks the plugin, which loads all the ‘green’ files which are in fact now renamed white files. Hey presto, a white menu. If you only want one part of the menu to be white, like hover, then change only one of the image files (above)