Griffin is on his grass mat and Twigs is on top of the large cage
I am a decorator by nature, but with the amount of "changing it up" a parrot needs to remain mentally stimulated (try new toys rotated in/out several times a week), theres no real good way to "decorate" a parrot cage. Bright and colorful IMO is a good way to keep them mentally stimulated. If your unsure what kind of toys your bird likes, there are 5 basic types and I would suggest you try one of each and see what clicks for him so you have a better idea of what to look for in the future-shredding, foraging, noise making, thinking and foot toys. Every bird likes different types of toys. My bird isn't big on shredding toys or ones that make noise. He does love foraging toys, foot toys and thinking toys (like untying knots)

His all time favorite is baby rattles and plastic baby keys (we have a LARGE collection of those

). My parents have 2 birds who won't play unless it's ripping something up and one who really only likes beads and marbles. Each bird is different. You need to understand what your bird likes to do before you start designing a "dream" setup

It's also important to know what your parrot likes to do where, and that will come with time spent with your bird and observing your bird. My bird tends to enjoy foraging and untying knots (low energy activities) in his cage, whereas he's much more active on his play tree. I disperse toys and perches accordingly. Heres Kiwi's setup-
Current cage setup (designed with foraging in mind):
I also keep a lot of easy to reach things to hang onto near his water dish since he enjoys bathing (and things get slippery

)
His much loved play tree (designed with exercise and a more active vibe):
And always think outside the box. Plastic toy teacup on the rope boing=perfect foraging cup!