With Oscars I think you're going to have to keep the glass lids because they tend to jump. As far as having something with a raised look, you'd probably want to look at something like (not specificly) a marineland led setup. There are plenty of brands to choose from, just giving you an idea, most of the led setups you find online end up being about and inch or so above the tank.
Another idea that tends to give the tank a finished look is a canopy. Other than that; clean, natural decorations are the way to go. Take your time and find yourself a nice piece of driftwood and some rocks. With Oscars you're in the same boat as I am when it comes to plants; they'll probably tear up real ones. But if you look around you can always find some nice, real looking fake plants.
Another idea that tends to give the tank a finished look is a canopy. Other than that; clean, natural decorations are the way to go. Take your time and find yourself a nice piece of driftwood and some rocks. With Oscars you're in the same boat as I am when it comes to plants; they'll probably tear up real ones. But if you look around you can always find some nice, real looking fake plants.