I actually found the pattern while I was looking through A Creative Being, which is an awesome blog. She makes great projects and is so fast! I definitely took inspiration from her color choices, too, but added a few more tones into mine. The pattern is actually here: Spring Petals Backpack. It took two solid days of crocheting for me -- maybe 14 or 15 hours? Each color change is actually two rows - the shells, but first there's a row of DC only to act as a base. I used three colors of Lion Brand Wool-Ease (cream, brick, and a dusty rose), as well as one Lion Brand Vanna's Choice (cranberry.) I also used a G hook.
I just love looking at it up close. I was like a little kid, obsessed with staring at it. It was so fun to watch it grow, too. I stopped every few rows to put it on the side of the couch to see how much taller it got in the last few hours. I was very proud of myself for learning this new pattern!