I present to you a list of startscreens and backgrounds of your favourite and popular clubs(only for HD).
Extract the file using Es file explorer or Zarchiver or any unzipping app you know.
Choose your favourite club startscreen/background from their various folder.
copy/move the files(in the folder) to android/data/com.sigames.fmm18mobile/files/installed/fmhi_hdtv_skin/images.
Incase you want to re-install the default startscreen/background i left a backup folder.
If anything goes wrong,comment below.
Any suggestions?,comment below.