Colorful Environment for Betta Fish

I have a pet betTa fish, named Nemo, who loves to look at colorful things. His food jar has a picture of a betta fish which he loves. He will get mad and swim frantically if the fish food jar is not put back just right. Just recently I put a frozen dinner cardboard empty container where he could see it. Besides playing in his cave (a moon rock from Walmart, 2 of them), he now constantly looks at the colors on the food package. Now the only time he wags his tail at me is when he is hungry and wants food. He has been a great pet and I like to make his days good ones full of interesting things.