I am going to do this for my group and thought I'd share. Basically, they'll have a ship's cat (or colony cat if they choose to be colonists.) Once per session it can be petted by a PC to remove one stress, even if they've already used their own signature item. There's a catch though! They have to find it and when they do they roll a d6.
On a 3-6, they find the cat and pet it. Stress -1
On a 1 or a 2 though the cat jumps out at them from a vent, on top of a cabinet, under a table, whatever and their stress goes up by 1!
Either way, they can't use the cat again until the next session.
What do you all think?