To make the rainbow tie-dyed surprise heart cake you will need:
Coloured Hearts
Makes enough hearts for two cakes 22cm (8.66 inches) long each heart or other shape cutter, mine was 7.5cm (2.95 inches) across and 7cm (2.76 inches) tall
3 packets vanilla cake mix
5 gel colours or you can use neon colours if you prefer
White Cake
2 packets vanilla cake mix
To Decorate
White fondant
Frosting (I used the frosting that was in the boxes of cake mix) colours as used for making the cake.