Maybe do a cake with a ball cake on top, then a fondant wig. Just something simple, and have a fondant pr of scissors sitting on the cake like just put down for a sec, and pieces of the fondant used in the "wig" lying around on the cake as well, like someone's getting their hair cut? Decorate the ball like a face, could even be cartoony instead of really anatomically correct. I wish I knew how Doug does those sketches of his, I know just what I'm talking about....but can't show ya.
Maybe do the writing "good luck in beauty school Soandso" on the cake that the "head" is sitting on, maybe under the scissors and fallen "hair".
Hey do you remember those big Barbie heads that were out. They came with rollers, a cape, etc. Or if you could fashion a cake to look like a mannequin's head with a roller in the hair, cape, etc that would be cute.
I would do the hair cutting stuff, or even just a pair of scissors in fondant standing vertically in the center and then around the sides do several faces out of fondant or buttercream, spaced out almost like you would polka dots, and put funky buttercream hairstyles on them with the grass tip.
It sounds like it would be fun!!
Heres a pic of the last cosmo grad cake i did. the drape in the middle is the cape, a shampoo and conditioner bottle, scissors and a mirror with the grads face in edible image in the reflection. hope some of the ideas you can put to use.
I up-loaded this picture for you...
I got a mold of a hair dresser set threw E-bay, I used chocolate melts in it and gave this to my Beautician for Christmas this past year...you could use something like this to decorate a cake with, even with using Fondant..
HTH,Mary 
Hello maeliza
I am sorry I do not have a picture to show you, but let me describe a cake that I made.
This was to celebrate an anniversary of 20 years being a hairdresser.
I started with a rectangle; centered on that was a cake made to look like a head. The eyes were closed so you could see the eye makeup (it was easy, just chocolate eye lashes & some color above them, & the eye brows beautifully arched; and pouty red lips... all this was done in chocolate.
There is a chocolate mold of hair curlers; I had made a few of these and placed them on & around the head.
on the corners of the rectangle I had a chocolate hair dryer, comb, brush & other rollers (the dryer, comb, brush are all in one mold... or you can make your own out of fondant. )
the rest of the cake decorations were in the color of the salon (yours could be the school colors) .
I then made lots of chocolor curlers, individually wrapped; for a whole week, each customer at the salon was given a chocolate curler to go ... sort of like a party favor.
just a thought
ciao
I did one for my hair dressers birthday in March. I found some clip art online and put parchment paper over the images and melted chocolate to outline and fill the images, using the flat side that down on the parchment paper as the top side on the cake. It was a red velvet cake with cream cheese frosting, his favorite. Not as professional looking as some of these and I didn't have molds - but he really liked the cake and has asked me to make a large one to celebrate the 10th anniversary of his salon in October.
I did one for my hair dressers birthday in March. I found some clip art online and put parchment paper over the images and melted chocolate to outline and fill the images, using the flat side that down on the parchment paper as the top side on the cake. It was a red velvet cake with cream cheese frosting, his favorite. Not as professional looking as some of these and I didn't have molds - but he really liked the cake and has asked me to make a large one to celebrate the 10th anniversary of his salon in October.
LOL cute cake- this is totally not an insult 
But that pic just made me think of edward scissorhands- LOL I'm thinkin how about an FBCT silhouette of Edward Scissorhands- and CONGRATS on the top of it LOL
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