This poem doesn't really have a theme, it just popped into my head.

Under the sea, fish_4.jpgfish_1.jpg
Gentle fish swim,
Their gleaming bodies reflecting light,
Above the wind create waves,
Ripples visible from underneath.

Under the sea, fish_5.jpgfish_6.jpg
Gentle seagrass grows,
Swaying and dancing in the water.
Between the grasses, small fish dart,
Safe from predators.

Under the sea,fish_7.jpgfish_8.jpg
Large, green turtles swim,
Grey dolphins dance and play,
Whales sing and bellow,
And sharks patrol their territoy.

Under the Sea,fish_11.jpgfish_12.jpg
Small crabs scuttle over sand,
Shells lay deserted,
Starfish cover the rocks,
And shrimp clean small rocks.

Under the Sea,
Fish and Mammals live in harmony,
Sea grass grows,
Fish swims,
And above the ocean,
A beautiful sunset rests.
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I used Personificion in this poem, as I described the sea grass dancing and swaying.