My white capped pi seems to get bored of most toys after a couple of weeks. However, there are 3 key things that I've found so far that are big winners for him.
Though he goes through them in a matter of days, he is obsessed with these
bird kabobs. If he's not busy destroying them, he loves to whap, attack, and run flappy circles around them.
If you're looking to try something with more longevity, I was surprised to discover that his current all-time favorite are these
humanoid, wooden bird toys. He will chew on it for hours and will gradually make work of each bead on it's limbs. I got one gifted from a friend at first, as I didn't think he'd pay much mind to a toy like this. But I was wrong.
Otherwise, he loves to throw things like toy rings, plastic balls, etc. off of high ledges and onto the floor. It also indirectly keeps our harmless cat entertained.
I hope this is of help!