Are you wanting to create your own embroidery for machine embroidery or hand embroidery?
Maybe you could do something like the flower of the month (using a flower for each month the person was born). Then put the person's name and birth date on that same block.
I am sure with that many to do, you want to keep it fairly simple so you can get it done by Mother's Day so I would not do anything terribly elaborate.
But I do love you idea! good luck :)