akiicat / vim-switching-colors

http://vim.wikia.com/wiki/Switch_color_schemes#Script

Vim Switching Colors

Setting colors

To use all installed color schemes ($VIMRUNTIME/colors/*.vim).

:SetColors all

To use the schemes specified (scheme names, separated with a space, for example, blue slate ron).

:SetColors blue slate ron

or

let g:themes = 'breeze earth less aqua gothic'

To display the current list of scheme names.

:SetColors

Switching colors

• Press F8 to use the next color scheme.
• Press Shift-F8 to use the previous color scheme.
• Press Alt-F8 to use a random color scheme.

nnoremap <F8> :call NextColor(1)<CR>
nnoremap <S-F8> :call NextColor(-1)<CR>
nnoremap <A-F8> :call NextColor(0)<CR>