For a fun look, dip baby's hands and/or feet in paint and create a collage of handprints and footprints in the opposite color for one of the walls.
There were handprints on the windows, as if someone had tried to escape, and blood splattered on the ceiling and the walls.
The access pad was useless, the clothing unit jammed, the communication monitor too covered with handprints from her searching to work right.
You may also wish to add your child's name, birthdate, footprints, handprints, or your favorite motherhood quote.
In one case, after a night of screaming incessantly, one inmate was found dead the next morning with distinct handprints around his throat.