Lucy planned our her rainbow-hello-kitty birthday cake for months before the big day. 
I don’t know that this was exactly what she had in mind, but she was pleased as punch about it, especially when we cut it open and she saw this rainbow surprise: 
This is what you do: Mix up a white cake mix. Separate the batter into bowls and add a couple drops of high potency food coloring. See those little bottles on the left below? You can get them at Michael’s or a cake decorating store.
Drop the batter by spoonfuls into a greased 9×13 baking pan.
Smooth it out so it will bake evenly.
Bake according to package directions. Then cut the cake into a hello kitty shape. (I just looked up Hello Kitty on the internet and drew it free-hand as big as I could on a piece of paper and then outlined it on the cake.)
I’ve always had troubles with crumbs getting in the frosting when I try to frost a cut cake, but I looked up this whiz-bang idea on the internet: frost a really thin layer first (no worries if there are crumbs in it). Refrigerate the cake for a 1/2 hour or so. Then frost it for reals. No crumbs. Decorate with jellybeans and black licorice. We frosted a bow cut from cardboard and lined it with rainbow skittles so she could see a rainbow on top.
Then we cut into that sucker and ate it up.
Easy-peasy rainbow surprise.
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super cute idea!! happy birthday lucy!
That looks amazing! And it actually does look do-able! Might need to give this a try myself sometime 🙂
What a brilliant idea! My daughter will turn 7 in December and she is going to LOVE it! I'm so glad you make homemade cakes, too. The prices for a cake at the store are ridiculous! 🙂
What a cute cake…we love homemade!
Shawni, I saw the new podcast button to the right and just bought them. SO excited. I listened to the freebie, and enjoyed it so much!!! I sent a question thru Power of Mom' site, but just in case you have time to answer it here (and others might need the info), do you know how to download them (all) to your device?? I want to be able to listen in the car, or on a run! Thanks!!
Another hint….freeze the cake then it is easier to cut to shape and frost!
Cute! We made your "tie dye" cake a year or so ago, and I even blogged about it.
So cute!
darling cake–thanks for the tips. Happy B-day, Lucy. 🙂
My youngest daughter loves Rainbow Brite and I would love to make a rainbow cake for her but thought it would be so much harder than what you posted. Thanks!!
Oh I love that cake! So precious. Thanks so much for sharing the how-to…I'm going to have to give it a try. My 6 yr. old son loves to help me bake, so I'm thinking with all these bright colors, he'd really enjoy helping me bake a rainbow cake.
many blessings,
jennifer
I don’t know that this was exactly what she had in mind, but she was pleased as punch about it, especially when we cut it open and she saw this rainbow surprise:hello kitty