I wrote a python3 script that will create your own bootlogo under linux/enigma2.
All You have to do is to prepare file named bootlogo.jpg with resolution 1280x720 in the asme directory where you uploaded this py file.
As a result bootlogo.mvi file will be created in same directory.
After that you have to copy it to /usr/share
call it by python
Maybe one day i will prepare GUI for that, but not now.
enjoy it ;-)