I found this recipe at Erica Sweet Tooth. There's also a similar one on the Wilton website. Another lemon-y recipe, but a declicious one!
I dyed my frosting pink, because the pink lemonade concentrate made the frosting a really ugly color, and of course I added sprinkles. I did yellow and white on some, and just white on the others. I didn't dye the cake batter at all, but I think pink or yellow dye would look good.
And, I added more pink lemonade concentrate (and water) to thin the frosting.
I cut regular bendy straws to decorate them, I cut the top part of the straw also, otherwise they looked goofy.