I haven't liked Lululemon's Modern Tee because of the vertical line running down the back and the boxy fit but there is a new Live Simply Crewneck out that looks really cute. It's also in some gorgeous colors. I must try it on. They are $48.
Live Simply Crewneck in Heathered Plum (love!), Heathered Wish Blue (love, too!), and Teal Zeal
Live Simply Crewneck - no more vertical seam. Yay!