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    Home » Blog » Blog Tutorials » Themes and Occasions » Seasonal & Holiday » Spring

    St. Patrick's Day Fun in the Blog~ Rainbow Filling Tutorial!

    March 7, 2014 By Melissa Diamond 21 Comments

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    Hi everyone! Today I'm going to share a fun and festive method for creating a striped buttercream rainbow filling for your cakes!

    Instead of tinting cake batter for a colorful cake, today's tutorial focuses on adding a little flair BETWEEN your layers. It's a quick, easy, and fun technique to have in your decorating bag of tricks!

     

    I started with three 8 inch chocolate cake layers, and about 1 cup of VANILLA BUTTERCREAM for each color.  (Looking back, ½ cup of each color would have worked fine..I had leftovers!) -

    Here are the coloring gel colors that I used:  Americolor Super Red, Orange, Lemon Yellow, Electric Green, Sky Blue, and Regal Purple.

    I filled my disposable piping bags with my tinted buttercream, and snipped off the tips.

    Learn how to make rainbow cake filling in this free cake decorating tutorial by MyCakeSchool.com!

    Starting with the red, I piped a circle (approx 1 inch wide) in the center of my bottom layer of cake.  I used toothpicks to mark off where my remaining colors would fall, allowing for about ½ inch for each color.  Adjust as needed depending on the size of your cake (mine is 8").

    Learn how to make buttercream rainbow filling in this free step by step cake tutorial by MyCakeSchool.com!

    Moving right along... I encircled the red spot of frosting with orange, then yellow, green and so on.

    Learn how to make rainbow cake filling in this step by step cake tutorial by MyCakeSchool.com!

    Next, I placed my next layer of cake on top of our colorful bullseye pattern, and repeated once again for another colorful layer of filling.

     

    Learn how to make rainbow buttercream filling in this free cake tutorial by MyCakeSchool.com!

    I placed our final layer of cake on top and frosted the cake with vanilla buttercream.

     

    Then, I added a few shamrocks!  Using buttercream tinted Mint Green, I piped heart shapes into a shamrock pattern using a Wilton tip 2.

    Learn how to make rainbow cake filling in this free cake tutorial by MyCakeSchool.com!

     

    I piped several more! (Some are a little larger, piped with a tip 5).

    Learn how to make rainbow filling in this free cake tutorial by MyCakeSchool.com!

    I added a few more dots of color to the outside and a small green bead border.

     

    Then, slice to reveal your rainbow!

    Learn to make striped buttercream rainbow filling in this free cake decorating tutorial by MyCakeSchool.com! Perfect for St. Patrick's Day!

    I hope that you enjoyed this little tutorial, have a great weekend!!!

    Related posts:

    1. Spring Cupcakes!
    2. Springtime Bunnies~ A Cake Tutorial
    3. The Very Hungry Caterpillar--Pull-Apart Cupcake Cake Tutorial!
    4. St. Patrick's Day~ Buttercream Rainbow Tutorial!~
    5. Sunflower Sheet Cake~Blog Tutorial
    « Fondant Ruffle Cake~ Video Tutorial
    Create Beautiful Fondant Floral Appliqués~ Video Tutorial »

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    1. Melissa Diamond March 21, 2014 at 10:25 pm

      Thanks for all of your comments!! @Scott~ We've missed you too! ;0) -

      @Trisha~ So happy to see you here, how much fun that Sophia's b-day is St. Patrick's Day ;0) - You will have to plan a rainbow sneak attack for her in your next cake, just for the fun of it! xoxo

      Reply
    2. María José A.G. April 7, 2014 at 3:28 pm

      sencillamente deliciosa, además colorida como a mi me gustan.
      besos

      Reply
    3. komal August 19, 2014 at 3:00 pm

      Very beautiful
      It seems hard but ur tutorials make it so easy
      I will try it
      tomorrow
      My son's b day

      Reply
    4. Ansa Hogan February 24, 2015 at 8:41 pm

      LOVE this cute idea!

      Reply
    5. Melissa Diamond February 24, 2015 at 10:23 pm

      Thanks Ansa!! xo

      Reply
    6. Adeoye K. Uwa March 10, 2017 at 10:21 pm

      Wawoo i love this. Thanks am going try it in my next work. Am glad to be here.

      Reply
    7. Melissa Diamond March 10, 2017 at 11:49 pm

      Thanks Aedoye! So glad that you plan to try it!

      Reply
    8. Crystal August 11, 2018 at 2:08 pm

      I love the look of this. How will the rainbow icing colors look inside of a marble cake

      Reply
    9. Melissa Diamond August 11, 2018 at 6:31 pm

      Hi Crystal, I think it would look cute!

      Reply
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