You can have all sorts of colour combinations for your MeldaProduction plugins by selecting colours in the Colour Settings window. As far as I can see, the colours you select are merged with colours defined in the Style to create the colours displayed in the plugin GUI.
To help me out, I've done two things for the Colour Settings presets:

Big pic: http://i.imgur.com/KBVRm.png
(a) Saving colour combos for each Style
-- I created a folder named "Styles" and a sub-folder for each Style
-- when I find a colour combo that works well with a particular Style I save it in the appropriate sub-folder
-- in the screenshot, I have two combos for use with the "Black" Style
-- this way I can easily use the same colour combo in several plugins.
(b) Saving default Colours
-- I created another folder named "Defaults"
-- when I load a plugin for the first time, I create a sub-folder for it and include the Style name in the folder name
-- you can see the names of several in the screenshot
-- I then save the default colour combo into the sub-folder
-- that way I can load the original colour combo whenever I need to
-- I may decide to save further combos into the sub-folders, knowing that the first one is always the original combo.
