rofi-background.py

import subprocess
from pynput import keyboard
import sys
import time

def on_key_press(key):
    if (str(key) == 'Key.esc' or str(key) == 'Key.enter'):
        subprocess.call(["kill", str(process_feh.pid)])
        sys.exit()

picture = "/path/to/your/picture"

process_rofi = subprocess.Popen(["rofi", '-show', 'run', '-config', '/path/to/your/rofi-config'])
time.sleep(0.03) # Edit this to sync feh and rofi better
process_feh = subprocess.Popen(["feh", '-x', picture, '--title', '\"rofi-feh\"', '--geometry', '960x360']) # Edit the 960x360 to fit your rofi

with keyboard.Listener(on_press = on_key_press) as listener:
    listener.join()