Habu Textiles has a base in New York and one in Kyoto (as Avril). They offer yarn in silk, cotton, rayon/ bamboo, linen, and wool, as well as the less conventional stainless steel, silver, and paper. The more uncommon yarn makes quite sculptural and architectural pieces and they work with the designers to make the most out of these. There are some very interesting designs. Here are two designers who caught my attention:
Collaborated with OlgaJazzy on Ori Ami Knits is Kirsten Johnstone, a Melbourne-based architect (who may interest the architect-knitters amongst us). She also works under the name Assemblage previously and her patterns are also available on Ravelry.