interesting idea: plant box and belts . Hook together several belts to be large enough to go around if using real leather belts (from thrift store) . these "belts" look more like strap webbing and could be DIY made to size.
Would be lovely with roses tucked in between these small evergreens. Bright and cheery in winter, plus structured around cascades of roses in summer. Abies balsamea ''nana'', siilivalkokuusia Picea glauca ''Echiniformis'', kartiovalkokuusi Picea g.