You can look up dishes like 炊き込み版 (takikomi gohan, rice cooked with meat, fish, and/or vegetables), 混ぜご飯 (maze gohan, mixed rice), the various types of おにぎり and おむすび (o-nigiri and o-musubi, rice balls) and even チャーハン/炒飯 (chahan or fried rice, though this is technically Chinese food that has become a staple in Japan as well).
That said, you are aware that far and away the most common way that rice is consumed in Japan is just as plain white rice with various dishes on the side, yes?