Nothing wrong with toys. Mine have lots of toys in their flight cage. They really play with them when they have no babies and the box is off, but I still keep them in the cage. Even if the parents don't play with them, the babies love them once they fledge!!
Didn't say toys are bad, but I know many breeders prescribe to the theory that breeder birds do not need toys. Toys distract them from breeding.
I also know there are some great breeders out there that provide toys and enrichment to their parrots and the birds breed just fine!!!
The main point is, is that the parents need to be taken care of well. They have brains and need things to do other than breeding. It *doesn't* have to be bird toys, but foraging activities and plants can still be a way to help enrich their lives.
Hybrids! I am still researching those, trying not to have a knee jerk reaction, but failing. I know they can be sweet, but it seems like a bad thing for me. As of right now my policy is "no, never." If in 40 or 50 years when we have hybrids who have proven themselves just as healthy and happy I MIGHT reconsider, but I have an additional problem besides the risk of unhealthy individuals, and that is our American parrot gene pool. Since 1992, we can no longer import most species, meaning what we have is all we have!
I really don't recommend mirrors anyway... not for single pets and not for multiple birds. Not a fan of dyes, either!
To go further into the hybrid area.... green cheek conures, senegal parrots, meyers, eclectus, sulphur crested cockatoos, red headed conures and many amazons are hybrids. If not species hybrids, then subspecies!
Unless you breed species that can't hybridize, or breed species that it wouldn't be hard to mistake a hybrid for a pure, it may be difficult to avoid hybrids altogether. This may be something you'll end up facing when looking to purchase breeding pairs.
Here's an example... this ad was posted selling a pair of jendays. The bird on left appears to be a sun x gold cap hybrid with the amount of green in the chest area. The bird on right appears to be a jenday with some sun traits leaking through. In other words, both birds may be hybrids and they are being sold as jendays.
Conure Pair For Sale in Hillsboro, Ohio - Hoobly Classifieds
Or this photo. Bird on left is a cherry head, bird on right is a mitred or mitred hybrid. The two birds are different sizes and have a different amount of red coloration. Even the amount of black on the flights is different.... yet, this breeder seems to imply that they are the same species when they aren't.
https://www.facebook.com/photo.php?fbid=316650635112965
So whatever species you plan on breeding, please make sure you learn enough about that species, or subspecies, to tell it apart from similar looking species/subspecies and hybrids.