1. Compile icecolsel and icefonsel:
    make
    
2. Copy icecolsel and icefonsel to /usr/local/bin or /usr/bin or
    othe directory from your PATH
    
3. Copy icewm.vim into system-wide or your own ftplugin direcory
    of vim
    
4. You can copy icewm.vim from subdir ./synatx into system-wide
    or your own syntax direcory of vim

5. Add this line:    
    au BufRead keys,menu,toolbar,preferences,winoptions,*.theme setf icewm
    into system-wide or your own filetype.vim
    
6. That's all

In Vim you can press F2 for select color or F3 for select font