I installed vim-powerline and was wondering how to change the backlground colour of the normal mode -- currently set to #adf000 according to the Gimp -- to something else.  I assume that the change will be in autoload/Powerline/Colorschemes/XXX.vim somewhere, I just cannot find it.
Vim powerline plugin colour of Normal mode
vim;gvim
The colours of vim-powerline should be located in your .vim directory. If you use a plugin manager it may be .vim/bundle/ followed by the vim-powerline/autoload/Powerline/Colorschemes tree. The file you are looking for should be the default.vim.The colour setting you are looking for is : .   \ Pl#Hi#Segments(['mode_indicator'], {         .   .   \ 'n': ['base03', 'green', ['bold']],      .   .   \ 'i': ['darkestcyan', 'white', ['bold']], .   .   \ 'v': ['white', 'orange', ['bold']],      .   .   \ 'r': ['white', 'violet', ['bold']],      .   .   \ 's': ['white', 'gray5', ['bold']],       .   .   \ }),                                     n is for normal, i for insert, v for visual, r for replace and s for selection(?). Additional colours can be defined in the call Pl#Hi#Allocate({ section.