Since sunsets/sunrises give just about everything a warm-looking tone, getting a red/yellow/orange look out of a photo shouldn't be too difficult.
Since the wide open sea is one color, the only problem I foresee in getting an ocean picture would actually be getting to the ocean...
I don't plan on painting my nails, but I couldn't pass up how original I thought this was. It may not be completely one color, but the red cheeks really stand out from the yellow.