Create one free-standing website page.
Draw a backpack with several 'panels'. Allow the user to select colours, tyhen click on a panel to fill the panel with that colour. Allow change. When complete, send an email with the image and order details (name, address, etc), email to website owner and user. Each order to have a reference number.
Selected freelancer will receive full spec and example site.
Development must be in a language supported by all platforms (ie. not Flash).
I have just been messed around by a 'Freelancer' developer for 3 months, so only serious, competent developers need apply.
Payment on completion to my satisfaction.