I prefer fannish stuff that’s like a secet code. A tee, for instance, that doesn’t blare a logo but sports a simple, elegant design that no one who isn’t in the know will see as a geek thing but that those who are clued in will appreciate. So I adore the designs by etsy jeweler FANaticCreations, who engraves tungsten rings with beautiful geeky symbols. Such as this one, of Gallifreyan writing:
And this one, with the seal of Omega:
And this one, in a TARDIS design:
Artist Haylee Barber has lots more (including in other fandoms). Go check ’em out.
(If you stumble across a cool Doctor Who thing, feel free to email me with a link.)