Line a rimmed baking sheet with parchment paper, overlapping the edges and clipping at the corners to hold it in place. Lay down graham crackers to cover the bottom of the pan.
Add chocolate pieces to medium microwave-safe bowl. Cook on High for 1 minute. Stir. Continue cooking in 15 second intervals, stirring each time until chocolate is melted and smooth. Spread chocolate over graham crackers, smoothing into even layer. Place pan in refrigerator for 15 minutes to set.
In medium microwave-safe bowl, repeat the melting steps for the bright pink candy melts. Spread candy over cooled chocolate layer into an even layer.
Melt light pink candy melts using microwave method. Drizzle over bright pink layer creating lines and swirls. Repeat steps for white candy melts.
Top with candies and sprinkles. Allow to fully set then break into pieces.
Store in sealed container for up to two weeks on the counter.