Well thanks, actually I'm using the Hellsing theme.
But I have also Atari 2600 and Hatari installed, and one of them already uses this icon. Thought perhaps of something 7800 related.
Would also be nice to have icons for the newest emulators like Hugo, Caprice32, fMSX... but perhaps I should use the same icon for the same emulation, as the text already says which emulator it is.