Python script, which generates colorscheme of current wallpaper using pywal, and applies to all Razer Chroma devices which are connected, using openrazer.
Python3 PyWal OpenRazer
Place script file somewhere you feel comfortable, and than just add it to autostart how you usually do it.
Warning: It's recommended to put script after pywal in autostart
Copy razerwal.py to ~/.config/i3/
# ~/.config/i3/config:
exec_always --no-startup-id wal -i ~/Pictures/wallpapers # Pywal startup (that's just example)
exec_always --no-startup-id python3 ~/.config/i3/razerwal.py # Execute the script