here's an idea: TTFN sign

We're big Winnie the Pooh fans in my family and we each have a character to represent us -- mine is Tigger! I decided to pay homage to my favorite bouncy tiger with this sign above my front door :)

My apartment is on the second floor but you enter at ground level and go up a private staircase to get there, so I thought I'd put a hello sign at the top of the stairs to greet guests when they're arriving (I haven't decided what that one is going to say yet..) and a goodbye sign at the bottom for when they leave.

It was so simple it doesn't even require a DIY post -- I just bought wooden letters at the craft store (already painted white) and attached them with Command strips. The whole project cost like $12. I haven't been super cautious about being renter-friendly (I got a list of how much each thing will cost to replace when I moved in and I'm just planning on owing some money when I move out, lol) but this project is definitely renter-friendly and so fun! :)