All the hints plus all the correct answers thus far:
A puppy can go through the green glass door but a dog can't.
A kitty can go through the green glass door but a cat can't.
a parrot can go through the green glass door but a canary can't.
Grass can go through the green glass door but dirt can't.
A ball can go through the glass green door but a chair can't.
A pattern can go through the green glass door but a rhythm cannot.
A baseball bat can go through the glass green door but a fly cannot.
A green dress can go through the green glass door but a stove cannot.
a bunny can go through the green glass door but a hare cannot.
A zipper can go through the green glass door but metal cannot.
A Week Can go through The Green Glass door but A Day Cannot.
A basketball can go through the green glass door but a basketball net cannot.