A themed party can be made infinitely better with color-coding. This means keeping the napkins, drinks, straws, plates and cups all one color. In this case, that color is lavender, and the theme extends to the cupcakes. Turning your formerly bland colored cupcakes a lovely shade of lavender involves starting with a white or vanilla cake mix. (White cake mixes will work better than vanilla, simply due to their base color.) Add in a few drops of food coloring before combining the ingredients, and voila!
Source Table Spoon