Wikipedia explains bonsai, in part, to be for "The purposes of ... contemplation (for the viewer) and the pleasant exercise of effort and ingenuity (for the grower)."
I don't claim to be a bonsai expert -- far from it -- but elements of bonsai seem to fit in well with my initial response to the color palette of "spa," a relaxing place for renewal and/or health.
In keeping with my self-imposed challenge to base my Colorplay pieces on traditional quilt blocks or patterns, this one was inspired by the Tree of Life, or Tree of Paradise block. The quilting is meant to look a bit like the raked gravel in a zen garden. The background fabric may be more chinese than japanese, but I did buy it from a japanese lady at an ugly fabric fund raising auction, so that's got to account for something! It took several iterations to get the right arrangement and scale of the half square triangles looking like a miniature tree, but I guess that was "the pleasant exercise of effort and ingenuity" for which bonsai is intended.