Yes I make mine from pine too. Even cut them up into sticks for them to chew.
Grape vines from the craft store are awesome, they come is strands and ready made items like wreaths, pretty cheap.
I save all my Tim Horton cup holders, small boxes, and I get large very hard cardboard tubes from purolater currier that are shipped to the hospitals. My son-in-law works at one and collects them up for me and my daughter.
You can get smaller ones from your local news paper, it's the center of their paper rolls.I get them empty for a dollar each and with left over paper for 4 dollars each. They last forever.
I took a kiddies slide from my neighbors garbage,It broke off from the swing set.I hung one end from eye hooks under their cages, and put a wood ramp up for them to get up on it. They love it,and use it every night.A bit of dust or baby powder really gets them going.
It's amazing how much fun the can have with old boxes. I stack them, open some, turn some upside down, even cut holes for their amusement.
