I have attached a few models for your viewing enjoyment. Stay tuned for more.
Step 1: Go the Wax Museum
Make sure the battery is charged and the memory card is clear. Bring extras of both if possible.
Put on your shoes and coat (if necessary) and go to the nearest wax museum.
We are going to the wax museum because unlike real celebrities, wax celebrities never move, twitch or sneeze. Wax celebrities can easily by captured using the photogrammetry method employed by 123D Catch. With some patience and a few dozen pictures, you can get a 3D model of anyone they have on display.
Step 2: Enter
Once you have your ticket, go inside. This will grant you a license to take just about as many photographs as you want.
As wax museums tend to be tourist destinations in larger cities, they almost always allow photography so that tourists can snap a carefully framed picture or two of their favorite celebrity. This is great, because we are about to take a lot of pictures.
Step 3: Photograph
Find a celebrity you want a model of.
Take a picture of the wax model and take a step to either side and take another picture. Repeat this going entirely around the model.
Once you have done this, hold the camera over your head, point it down at the model, and circle it again.
Lastly, crouch down and repeat this process, but shooting upwards.
The goal is to capture as many different angles of the model as possible in photographs.
In the wax museum I visited, most of the models were back against a wall, so I could not entirely circle them. In this case, I tried to capture as many pictures as I could within the area in which I was allowed to approach the model.
Note: If anyone asks what you are doing, tell them you are a photography student on a class assignment. It is helpful to have more people with you because you can capture more celebrities more quickly, and because it looks less weird when doing this in a group.
Step 4: Make Models
If you have not yet downloaded 123D Catch, now would be the time to do it.
Start up the program.
Click "Create a New Photo Scene" and select all of the pictures of a single celebrity and click "Compute Photo Scene."
In 15 - 20 minutes time you should have a 3D model of the celebrity in the pictures.
If you took pictures with a group of people, you might get the best results by pooling all of your pictures.
Should your model need some correcting or touching up, check out ShadyLogic's instructable on turning yourself into an action figure using 123D Catch.
Step 5: Export
Open it in 123D or similar (I often use 3DS Max), and do whatever you want with the model. Multi-headed celebrity ball? Sure! Celebrity toothbrush holders? Why not! Celebrity themed iPhone cases? Obviously!
Once you are done, just make sure that it's saved as a water tight STL... assuming you want to 3D print it.