Yes! I have added a 50% Super Wash Merino Wool/50% Tencel base. This base is available in the following weights:
DK (Double Knit) Weight
225m (246 yd) per 100g
WPI: 20
Single Crochet Gauge: 3.5mm - 22 sts & 28 rows
Knit Gauge: 3.75mm - 21sts & 34 rows
Fingering Weight
333m (364 yd) per 100g
WPI: 22
Knit Gauge: 3mm - 26sts & 38 rows
Lace Weight
800m (874 yd) per 100g
WPI: 28
Knit Gauge: 3.75mm - 23sts & 40 rows