No matter what fandom you belong to, there is most probably already a pretty cool doormat available that suits your need in terms of welcoming your guest.
There is nothing better to let people know what they can talk to you about when visiting you. Geeky doormats are basically a last resort in case of awkward silence with guests.
I went and found (in my opinion) the best doormats for your fandom needs:
You Shall Not Pass
Did You Bring A Schrubbery?
This Isn’t The House You’re Looking For
Valar Morghulis
Wizards Welcome (Muggles Tolerated)
It’s Bigger On The Inside
Speak, Friend And Enter
Hold The Door
