Line the bottom of a 8x8 square pan with parchment paper and spray pan with nonstick cooking spray
In a medium microwave proof bowl add the white chocolate chips
Add the semisweet chocolate chips to another medium microwave proof bowl
Add 1 TBS butter to each bowl
Pour half the sweetened condensed milk over the white chocolate chips, pour the other half over the semisweet chocolate chips
Stir each with their own spoon (you don't want to be getting chocolate in your white chocolate right now) until the milk and butter are combined with the chips
Put both bowls into your microwave and cook for 3 minutes, stopping halfway to stir once.
After 3 minutes of microwave cooking, remove both bowls and stir each separately with their own spoon until all is smooth and mixed in
Add most of the pomegranate arils (3/4 of the arils) to the melted semisweet chocolate chips and gently fold in
Scoop spoonfuls of the melted semisweet chocolate into the square pan - scattering randomly throughout the pan
Scoop the melted white chocolate chips in the empty spaces
Pat the pan on the countertop to evenly distribute and fill in to cover the bottom
Take a table knife, pull it across the pan back and forth one direction
Do the same back and forth across the pan the other side to swirl the fudge
Sprinkle the remaining pomegranate arils onto of the fudge and slightly push in to set
Refrigerate for 2 hours to firm
Cut into squares to serve
Refrigerate any remaining fudge