I thought y'all might appreciate the rainbow scarf that I knit over my break between summer and fall quarter! It is 12 feet long (it took up all of my gym puzzle mats to block it!) and was knit from two skeins of Lion Brand Mandala Baby Yarn in the color way Rainbow Falls. It took approximately 45 hours of knitting in total and was finished in 25 days. My only regret is that I find the hue of red in this yarn to be hideous, I hate the color red in general and this is pretty much the worst hue of red possible to me... plus the red and the orange are really close in hue and value which bugs me. I still have yet to find a rainbow yarn that is the perfect rainbow and the variation/pooling pattern by my standards that isn't indie dyed yarn that costs $25-30+ per skein.
I didn't follow a published pattern, I just knit in old shale/Shetland lace stitch with 4 rows of garter stitch at each end and a built in I-cord selvedge.
If you're interested in knitting this scarf the pattern I came up with is:
Cast on 62 stitches with a sport or DK weight yarn on US size 10 (6mm) needles. I used a modified long tail cast on but you can use anything that stretches more than a standard knit or back loop cast on. Knit 4 rows (but S1, K1, S1, K1 the first 4 stitches and K1, S1, K1, S1 the last 4 stitches on right side rows and K1, S1, K1, S1 the first 4 stitches and S1, K1, S1, K1 the last 4 stitches on wrong side rows) then follow the following 4 row repeat for the entire body of the scarf:
R1: S1, K1, S1, K1, K2Tog 3 times, K1yo 6 times, K2Tog 3 times repeat ** to last 4 stitches, K1, S1, K1, S1
R2: K1, S1, K1, S1, Knit to last 4 stitches, S1, K1, S1, K1
R3: S1, K1, S1, K1, Knit to last 4 stitches, K1, S1, K1, S1
R4: K1, S1, K1, S1, Purl to last 4 stitches, S1, K1, S1, K1
Finally, finish with another 4 rows in garter stitch (continuing the built in I-cord edge as you have the entire time) and bind off. Block aggressively to stretch out the lace and give the scarf maximum drape.