Like a flower bouquet you bound by yourself (for example lilacs or peonies), delicious, self baked cookies, self made pralinés or a lovely card you handicrafted.
Surprise your mom with an extraordinary breakfast, invite her to a picknick, organize a cocktail hour for the both of you at home...
But even a bought scented candle, for example a fresh citrus smelling one like "Sparkling Lemon" by Yankee Candle, can make a mommy happy and help her relax from the exhausting everyday life.
Just be a bit creative and the eyes of your mom will glow and tear up.
Show her how much you love and appreciate her. Your mother deserves it!