The murals have been popping up for over a year.
A Laois Tidy Towns Team is trying to track down a mystery artist.
Alien murals have been appearing around Portlaoise, with some featuring the signature of an artist known as 'pancake.'
The first sighting was over a year ago, but now there are many more little green men popping up in different locations across the town.
Vincent Booth, of Portlaoise Tidy Towns, says they are in favour of murals but in a more controlled way: