I really love this idea, would like to incorporate in the stone in the basement area instead of mosaic risers - I've re thought this and think may be too overpowering. Thinking tiled risers and small pebble mosaics in floor would be much nicer.
Nice planter using broken pieces of stone or slate. We have a variety of slate, fieldstone, and PA blue stone that could be beautifully repurposed into this planter! Fun project for dad and the kids :)