I'm using this post as an opportunity to share a picture of my contribution.
The original template for this piece is probably an Akasaka Tsuba. The flowing design represents a Waka poem from the Kokon Waka Shu 古今和歌集:
ほのぼのと明石のうら朝ぎりの島かくれゆくふねをしぞおもふ
"In the bay, of Akashi, when the day is drawing to an end, my thoughts follow a boat which disappears behind an island in the mist."
Thanks
Christoph