21 of the most AMAZING rainbow cakes that you'll ever see (recipes included) Bright colours, pots of gold, blue skies...what's not to love about a rainbow birthday party? Especially when one of these gorgeous cakes takes center stage. We're obsessed, and we've rounded up recipes and easy-peasy tips for recreating them without the fuss. Colourful Cupcakes We love how simple these rainbow cupcakes are to make: Just buy a few boxes of vanilla cake mix, make the batter and then separate it into five bowls. Add food colouring to get the colours of the rainbow, and then pour each colour into the cupcake pan one layer at a time. (For the best results, follow this tip: After pouring each layer, dip your finger in water to smooth over the mix before pouring the next -- it keeps the colours from blending together.) And once they're out of the oven and cooled, add a dollop of vanilla icing on top for the cloud. Cotton Candy Treats It's not just a rainbow-coloured confection, it's shaped like a rainbow, too! To make, simply bake a round cake, let it cool and then use a 7-9cm round cutter (see it here ) to cut a hole out of the middle. Then, cut the cake in half to make the arch shape. To finish, cover the pieces in vanilla icing, top with M&M's and stick pieces of blue candy floss to the ends to make clouds. (Add those just before serving, so the candy floss