TARDIS EXTERIOR: Black Hole Tardis
WHY I WENT WITH THIS DESIGN: Well that is an excellent question.... what? Do you expect me to know? It just kind of popped in my head. But honestly it does seem like an effective disguise depending on where you are, if you materialise your tardis in the middle of space it's a good way to keep people away I guess, although in that case it would probably be difficult getting to and from the tardis.
IMAGES:

NOTE: The second picture shows the open variant and the green represents where the BOTI portal would go. If it were added the cartridge item would likely be a Dimensional Circuit. Something I thought of for the ring is to potentially have it adapt it's colours based on the biome it's in, don't know if that's doable but it would be interesting.

Forgot to add to the notes: The ring should be spinning at all times and when open the flat textured ring should track the players pov similar to how the doom tardis does it

Something I thought of for the ring is to potentially have it adapt it's colours based on the biome it's in, don't know if that's doable but it would be interesting.

 Ignore this, it didn't happen