vimrc: add colourschemes for rainy days

.vim/vimrc

@@ -17,7 +17,17 @@ autocmd VimEnter * if len(filter(values(g:plugs), '!isdirectory(v:val.dir)'))
 
 " both "filetype indent on" and "syntax on" are called by Plug, keeping DRY
 call plug#begin()
+" colourschemes
 Plug 'liuchengxu/space-vim-theme'
+Plug 'nikolasvargas/spacemacs-theme'
+Plug 'cocopon/iceberg.vim'
+Plug 'sainnhe/edge'
+Plug 'chriskempson/base16-vim'
+Plug 'axvr/photon.vim'
+Plug 'Lokaltog/vim-monotone'
+Plug 'https://git.sr.ht/~romainl/vim-bruin'
+Plug 'fxn/vim-monochrome'
+
 Plug 'vim-airline/vim-airline'
 Plug 'vim-airline/vim-airline-themes'