try giving him a bunch of plastic drinking straws. lots of quakers like weaving them through the cage bars and basically just making a mess with them. I used to have several pictures of this that I found online (because it looks funny seeing their cage all covered in straws) but that was on my old computer... you could also try craft sticks (popsicle sticks) and other nesting materials. that might keep him busy while you're away. cheaper than trying a bunch of new bird toys, too. Buy him a new rope toy, though, since you know he loves those!