I have a setup with custom platforms for hacks (NES Hacks, Super NES MSU-1, Nintendo DS Hacks etc.) and I made clear logos for each and it looks great on PC.
My issue with LaunchBox for Android is that the custom logos won't appear in the Platform view even if I select them in the edit Media section. I found a way of having them appear by editing the Metadata and switching ''Scrape As'' to (None). The problem in doing so is that the emulator selection won't be showing appropriate emulators such as RetroArch, it'll only show ''Custom Emulator'' and so the games can't be played.
For example, my Nintendo 64 Hacks platform can only run games if I set "Scrape as" to Nintendo 64 but doing so prevents the platform from having its own Clear Logo.