9.) Colors

"Green is a lovely colour. It is the colour of Islam. It is my favorite colour." - Pi
After being at sea seeing predominatly only the colors orange and blue, the green of this lush island was a god sent. His three religions were very important to him, Islam being the latest addition to his arsenal was mentioned in this quote. He held his religions very deep to his heart, they helped him survive.

Orange doesn't have much symbolism but many phyisical relations to the story. First of all, the second main character is a tiger. Tiger's are orange. Also the raft, where he spent seven months of his life, was orange along with all the supplies aboard the lifeboat. An important supply that was directly pointed out as orange would be the small collection of whistles. These whistles were the reason Pi was able to successfully tame Richard Parker, the tiger, into subordination. Without them he would've been killed by Richard Parker.

7.) Artwork

Well there's no deep symbolism with the tiger in this piece. Pi's only companion for 7 months, only reason he survived, only reason why he was able to keep on living was due to the tiger, Richard Parker, in his life boat.
The orange paint can relate back to his life on the boat because everything he could see, while on that raft, was either the blue of the ocean or orange. The raft was orange, his life saving whistles were orange, Richard Parker was orange, even the tarp which he slept underneath was orange.