In art, presentation matters. A simple mat, border, frame, or even lamination goes a long way (especially in kids art).
Not every piece can be framed and some projects are better as cards or hung with a thumbtack on daddy's office wall. So adding a simple border really makes a toddler's abstract piece look more purposeful and even professional.
Here is Noël B's mixed media art piece for this year's Father's Day. She used watercolor and crayons. Her choice of colors, of course!
To recreate Noël's Father's Day frame- we used black cardstock paper and measured a 3/4" border around her mixed media art piece, everything is held together with glue stick