Unfortunately, back in the Beta Test something like this was asked and the development team basically replied why it could not be possible (specifically, allowing players to make their own FC logo artwork and use that instead of the image templates provided), in that human nature being what it is, someone would inevitably find it funny to upload something sexually explicit or offensive, which would require SE to have to police such content, eating into development time and resources, which they just do not have.
Sadly, speaking as an artist myself I would
love to have such a feature, but given what they said during the Beta, it's pretty clear they're standing firm on this (instead, this is kind of why they run art/design contests
outside of the game, as it's easier to screen art submitted to ensure it complies with the Terms of Service - after all, the BRD's Performance function has strict terms surrounding it's use regarding copyright that SE enforces, and that cannot be recorded by default, so allowing players to make their own artwork for display in a house and all the extra scrutiny that would require would be just be even more restrictive by necessity, and thus too difficult for SE to have to deal with I'm afraid.
