I have mine by itself... love the look of it. you might consider cutting the blue gravel into the ecocomplete, so it doesn't mix as much in the center of the stream... use a puty knife or trowel to create more distinct areas. the edges will bleed, but that will look better than a mix of black and blue. you can also use strips of flexible plastic to push back the eco, fill the gap with blue, and then remove the plastic once it has settled.