Just dye the egg whites after you remove the yolks. Drop them in a glass of 1/2 cup of water with 4 drops of food coloring. Red dye makes a brilliant pink. Blue and purple take a little extra time. All of them need to soak for about 10 minutes ~ just enough time to whip up the devilish filling. My secret to a great filling ~ a dab of horseradish with mayo & pickle relish. Devilishly good!
Oh, and I almost forgot... a cookie scoop is the perfect tool for filling those pretty eggs.