Rainbow Cake!

Update 4: The post that will never end! Here are pictures of what the cake looked like inside:

Update 3: Sorry I didn't finish this post yesterday. We had to get to the party! The cake turned out well. Here are the ingredients I used:

Can you tell where the batter got out of line? (Bad red, bad!)

It made for a lovely dirty dishes display if there every was one.

Tips for next time: I stirred the frosting mix by hand. It might have spread easier if I had whipped it with the mixer.

Unfortunately, I forgot to take my camera to my parents' house, so I don't have a shot of what the inside looks like, the whole reason the cake is cool! I'm really sorry - I'm such a bad blogger! It looks awesome inside, I promise. Next time I'm going to use a regular recipe and not the "diet" version. The cake was too dense for my taste, but it didn't stop me from eating a big chunk! Bottom line: this is such a fun cake and a guarantee smile booster on a cloudy day

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Update 2: So far, so good. I didn't use as much food coloring as The Onomicon did, so a few of the colors may come out a bit more pastel. I had to bake the cakes almost an extra 30 minutes, so I'm a little concerned about how the bottoms of the cakes will turn out. I checked them every 5 minutes using a toothpick in the center after the initial 29 minutes. As she mentioned in her blog, the density of the soda-cake method will need longer a longer baking time. I just was not expecting that long!
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Update 1: I'm attempting to make this super fun Rainbow Cake from The Omnomicon which was featured on One Pretty Thing. It's for Mom and Grandma's birthday celebration later today, so wish me luck. I'll update the results later. Happy Sunday!