DON'T WANT TO PAINT WHOLE WALL

HI YALL.I AM GOING TO REDO MY DAUGHTERS ROOMS THEY ARE 6 AND 20 MONTHS.THERE IS A FULL SIZE BED AND A TODDLER BED TWO WALLS ARE CANDY PINK AND TWO ARE PURPLE PASSION.THE TRIM IS WHITE AS WELL AS THE DRESSER.IN THE COMFORTERS THERE ARE SEVERAL COLORS LIGHT PINK,HOT PINK,TURQOISE,PURPLE,AND A LITTLE GREEN.THEY BOTH HAVE BUTTERFLIES ON THEM JUST NOT EXACT.I WAS THINKING OF PAINTING THE BOTTOM OF ALL FOUR WALLS WHITE AND PAINTING A BORDER OF POLKA DOTS IN THE MIDDLE SINCE IT WOULD BE SOMETHING SIMPLE MY SIX YEAR OLD COULD HELP WITH.WHAT DO YALL THINK THAT WOULD LOOK LIKE AND ANY OTHER SUGGESTIONS ARE MORE THAN WELCOME.THANKS A BUNCH!!