I find this a most beautiful idea: to get a more or less randomly striped scarf you relate a beautiful blue to every wheather and knit every day a little piece reflecting the wheather of the day: a sky scarf :)
By the way, I heard that somebody knitted the sky scarf with grey beads for rain and white sequins for snow!
Links:
Sky Scarf
via: Knitting Projects | Free Creative Knitting Patterns by Lea Redmond
via: Sky Scarf by Lea Redmond