Planted marine tank in an aquascaping contest
Halophila's beautious seagrass tank, some adds from Eleodes (all macro)
This one, while rock heavy, has great color contrasts and should be pretty cool once it grows in a bit
There are a couple threads that were attempts to get more pics of marine 'scapes but my pics are the only ones left in the threads in most cases. People musta pulled their originals from the hosted sites.
Basically, a lot of the design elements of freshwater fit while others do not. We have great color variety - reds, blues, greens, browns, whites (nearly). Substrates are different though.. no driftwood, but we can use lots of different rock formations and substrates. I think making canyons and valleys and small piles of rock as focal points is a very interesting idea. Like freshwater I think the number of focal points is key.. one or two for small tanks and more as the size of the tank increases. But there should be plenty of interesting things for the eye to concentrate on across the layout.
We also have an advantage in the various shapes and sizes of the plants. Just look at the Caulerpas! Sawtoothed, spheres, blades, mini-blades, cups, mushrooms, etc etc etc.

Oh.. and we mustn't forget that several of the algaes fluoresce (Distromium, Halymenia, Dictyota). Show me a freshwater weed that can do that.
I'm sure you've seen this but for others who havent, this is great inspiration:
AGA Aquascaping contest. AGA scoffs at marine for now.. we'll see if we can tempt them to think otherwise in the future.
Anywho.. I still think we are very much behind in simple husbandry of the plants and that we need to understand this best before jumping into husbandry. But... considering more.. if we dont have really pretty tanks to look at from toying around with aquascaping then we wont get any more people interested.
>Sarah