I like the simplicity of the hardscape, I can pitcure a nice green carpet in the foreground.
Stevenlau, I have struggled to find the example of Yamaya stone that I remember seeing before. Regardless I was able to track down this image which hopefully presents the idea a little bit... [Click Here for Image
Random info, if you invert the colors in the pic in the link, the black portion on top has a hidden image as does the lower portion....not just zoomed in but an actual different photo. You can tell by the direction/position of the rasboras in the top one, and the slender fish in the bottom one.