Above is an idea I had while working on a project for uni, the idea came from drawing out simple sketches of animals (mine being my pet hamster Fooey, named him after seeing the Foo Fighters at the Isle of wight festival) I was quite pleased with the outcome of a silhouette image of my hamster, which i thought could work well for a repetitive pattern. As you can see the above images are the outcomes of my ideas.
The other idea coming in to these pieces was to have a surprise element e.g. one standing out. So I decided to add a longer tail to one of the silhouettes to make it look like a mice/rat/mouse was trying to imitate the hamsters to try and fit in.