4 Year Old Birthday Cake Ideas Please !!
Decorating By Suzie757 Updated 24 Apr 2007 , 10:10pm by Lybby2000
My brother-in-law's wedding cake had clear glass balls placed all over it that looked like bubbles. It looked really great. They looked like those clear Christmas tree ornaments without the opening and hanger at the top. I don't know where they got them, though (this was before I started doing cakes myself). Anyway, I hope this helps you a little.
I found this website. It´s a wedding cake but maybe you can incorporate colored bubbles and perhaps do in fondant or gumpaste the stick used to make bubbles and a jar.
http://www2.hawaii.edu/~krystle/bubblecake.htm
toba garret has sugar bubbles in one of her books, but i would not advise you go that route, honestly. although i love them, it takes quite a bit of setup and equipment, and is extremely risky, according to her, for burning yourself.
you didn't say how many this cake would be serving, but what if you go to dollar general and get a 6 pk of cheap bubble mix. i got one not too long ago for my daughter. empty out several of them and steralize them well, then put them around the side of the cake, or like pillars holding up a small second layer. if you or your significant other has a drill, you could even cut them in half, and put just the halves around the sides. then make fondant ball, and put them with several pastel shades of shimmer dust to get the bubble effect.
you could do all this with gumpaste also, but i'm not sure how much time you really have for them to dry.
maybe you could find a jar candy mold, that would be reminiscent of a bubble jar even...
I have two different ideas for you. One is to ice the cake in butter cream, the put fondant circles of different sizes on the cake. I would do two or three shades of blue and them some in white. you can stagger them all over the cake, you could even stack some of them on top of each other. the different shades of blue would give it "depth".
My other idea is a clay press. I bought some at Hobby Lobby a couple of years ago in the clay section. They are clear plastic sheets that have imprints on them. you would ice the cake in butter cream and let it crust good. then you lay the plastic sheet up against the cake and "rub" the pattern into the icing. I have a picutre on my other computer of a cake like this I have done where I pressed butterflies into a cake. If this sounds like something you would like, let me know and when I get to my other computer, I will post that picture for you.
Good Luck!
Kandi
If it's a flat type sheet cake, you could do the bubbles out of piping gel. Or if you wanted more 3-d like bubbles, maybe you could make "bubbles" out of fondant shaped into different sized balls and paint them with some paste color mixed w/ alcohol (vodka, light rum, etc.). Hope my ideas helped a little 
I made fondant 'bubbles' for my bathtub cake--
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just blue/white fondant painted with pearl luster mixed with vanilla...
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