[liyanchang]

Actually a really cool way of storing passwords in plain sight.

EDIT: Though if you were really secure, you shouldn't be typing your passwords into a third party website in plaintext. Alas, I'll have to write my own.

[hk_kh]

That's an interesting idea.

A big QR-code in your table is something obvious to scan, and aesthetically ugly. A framed picture not so much, and could serve a similar purpose.