Since I don't use Android, I'll list the steps I use to create and load custom moboot images through webOS. Choose the image you want, and convert it to .tga format with RLE compression.
For a moboot background you need to name the file moboot.background.tga
For a custom bootscreen once you make your choice in moboot, use the same conversion process and name the file moboot.splash..tga
Once you have these files, transfer them to your TP, and copy them to /boot, reboot and enjoy.

One note, when using fullscreen images, there is a filesize limit, but I haven't had a chance to figure it out what it is yet. Hope this helps.

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