This is a project my kids did a few years ago for their grandmas for Mother's Day. If you have more than one child, you could have them each make a handprint on one pillow to make a bouquet, or they can each make their own pillow.
What you need:
1 White washcloth
1 Washcloth of your color choice (except white)
Acrylic paint for flowers
Green fabric paint
Glue - tacky glue or a hot glue gun work best
Stuffing
What you do:
Paint your child's hand with the acrylic paint and have them make a handprint on the white washcloth.
Using the green fabric paint, draw a stem and leaves below the handprint.
When the paint is dry, glue 3 sides of the washcloths together. When the glue is dry, stuff your pillow and glue the final edge closed.