why you need a preview of the other layers ? you can't just watch them normally ?
Time ago here i played with O with some tweaks of a cool tutorial of RobA , and some derivates of his "environmental map" because one of the most cool effect of the filter come to use a enviromental map
(that can be chosen in the opened image....if i remember well should be another single layer image not a layer
i still use a copy of that map as Map for M3D let'me found it..it is my map 111 (because 111 is easy to remember ...here it is but all merit is from RobA
![Image](http://www.gimpchat.com/files/158_111.jpg)
oopps maybe it is not the original but anyway close should work fine for gold effect
maybe even this would do some gloomy effect ?
![Image](http://www.gimpchat.com/files/158_63.jpg)
not yet tested...
![Image](http://www.gimpchat.com/files/158_41.jpg)
![Image](http://www.gimpchat.com/files/158_102.jpg)