In my experience when people do kind things they want their name attached to it. The converse appears true with the Colgate Yik Yak story. I decided to release some anonymous positivity in my college residence hall with these signs.
Anonymous Kindness

Update: 2/7/2015

The signs I posted seem to be really popular with the people that live in my college residence hall. I checked yesterday and only one tag was left.

Anonymous Kindness Update