There are several options in the design phase, to download a model, alter a model or design your own.
I chose to design my own statue using Trimble Sketchup however any program which exports an STL file can be used.
Trimble Sketchup can be downloaded here
To give Sketchup the ability to export STL files I use the plugin SKP to DXF or STL from here
or a different one here
Copy the skp_to_dxf.rb file into Program Files/Google/Google Sketchup 8/Plugins file on a windows computer
If you are on a mac there are many online tutorials which tell how to install plugins in Sketchup
The statue design is based on the Greek Statue of Nike
The design must be a single group in Sketchup, then under the plugins tab at the top select the export STL option and set units to inches. Save the file somewhere it can be easily found
My angel of Nike design can be found here