Yarn: Filatura Lanarota Puno (100% alpaca, 100 yds/50gr), colorway 1526, most of three balls. I bought this yarn last year at Smiley's Yarns internet sale ($2.99/skein), intending it for the RSP, but a proper scarf really would have required another ball; I didn't figure that out soon enough. So the yarn sat -- and sat -- until I bought some other yarn for the stripes: KnitPicks Andean Silk (55% superfine alpaca, 23% silk, 22% merino wool; 96yds/50gr per skein), one ball each of Navy and Hyacinth, plus a bit from a second ball of Hyacinth. This scarf is also sinfully cuddly.
Pattern: Standard scarf, 2x2 rib; slip the first stitch of each row purlwise. Narrower stripes are 4 rows each; wider ones are... wider.
Needles: KnitPicks Options, US#7.