DOes these colors has special meanings?

A little blue, brown and green for our red, white and blue.


The author was talking about sorting trash in his home whe the disposal company distributed three trash cans (whit the color of blue, brown and green). The authour (a housewife) dislike the disturbing sorting, but eventually got used to it and began to like it. One day her hunband found her sorting trash after dinner. Then bagan the following conversaton:


Time passed, and months later my husband stood in the kitchen after dinner.
"What are you doing?" he said.
"Smashing this cardboard carton for Big Blue." I had it on the floor, with one foot
holding it down while the other foot flattened the end.
"You, sorting trash?"
"Yes, and don't be so shocked. It doesn't take as much time as I thought.What happened to fussing about three separate containers?"
"I don't know. I guess I hated change. But now that I'm used to it, I love doing
my part."
"That's my girl," my husband said, when he took me in his arms and hugged me. "And look at those muscles you're getting. Almost as big as mine."
"Not quite,"I replied. "But here, use yours to take this stuff outside." I handed
him the squashed cardboard and the rest of the garbage. "And make sure you put it in the right bin: Brown or Blue."
"Got it," he said with a wink. "A little blue, brown and green for our red, white
and blue."


What does the author's huaband mean by the last sentence?