My Eclectus loves his mirror toys. He goes nuts looking at himself, regurgitating on the toy, with his eyes wildly pinning. He also likes "making love" to it, birdie style. My Quaker taught him how to use toys for sex, since the Quaker is an expert at it. It was a relief when he learned, since before this he'd try to use ME and would scream his head off when I'd stop him! Ugh!
The Quaker's favorite toy is anything with yarn. He also loves weaving his chain toys through the roof bars of the cage. He's always busy with his toys, moving them around and figuring out new things to do with them.