Storing images as blob in appengine(<1mb)

I created something simliar to what you want to achieve.. Hope this helps

image.py

    import os
    from google.appengine.ext import db
    from google.appengine.ext import webapp
    from google.appengine.ext.webapp import template
    from google.appengine.ext.webapp.util import run_wsgi_app
    class Profile(db.Model):
                    image=db.BlobProperty()
    class disp_image(webapp.RequestHandler):       
                    def get(self): 
                        key = self.request.get('key')
                        image = Profile.get(key)
                        self.response.headers['Content-Type'] = "image/png"
                        return self.response.out.write(image.image)
    class MainPage(webapp.RequestHandler):
        def get(self):
            image = self.request.get('image')
            pro=Profile()
            if image:   
                pro.image = db.Blob(image)
                import logging
                logging.info('persisted')
                pro.put()
            prof=Profile().all()

            return self.response.out.write(template.render('view.html',{'prof':prof}))
        def post(self):
            return MainPage.get(self)
    application = webapp.WSGIApplication([
      ('/', MainPage),
      ('/disp', disp_image)
    ], debug=True)
    def main():
      run_wsgi_app(application)
    if __name__ == '__main__':
      main()

view.html

  {% for prof in prof %}  {% endfor %} 

app.yaml

    application: sample-app
    version: 1
    runtime: python
    api_version: 1

    handlers:
    - url: /.*
      script: image.py

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