For this article I was using Windows Azure and SQL Database Tutorials - Tutorial 3: Using Windows Azure Blob Service.

In your controller you must to have code like:

 

public class BalooController : Controller
{
	private MyTableDBContext db = new MyTableDBContext();
	private const string messageImageBlobName = "golfermessageboardpics";
	private CloudBlobClient blobClient;
	private CloudBlobContainer blobContainer;
	private static CloudStorageAccount storageAccount;
	private CloudTableClient tableClient;

	public BalooController ()
	{
		string connectionString = RoleEnvironment.GetConfigurationSettingValue("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString");

		storageAccount = CloudStorageAccount.Parse(connectionString);
		tableClient = new CloudTableClient(storageAccount.TableEndpoint.AbsoluteUri, storageAccount.Credentials);
		tableClient.CreateTableIfNotExist("myBlob");

		blobClient = storageAccount.CreateCloudBlobClient();
		blobContainer = blobClient.GetContainerReference(messageImageBlobName);
		blobContainer.CreateIfNotExist();

		var permissions = blobContainer.GetPermissions();
		permissions.PublicAccess = BlobContainerPublicAccessType.Container;
		blobContainer.SetPermissions(permissions);
	}

	//
	// GET: /Baloo/

	public ViewResult Index()
	{
		return View(db.BlobModel.ToList());
	}

Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString
is in
MvcApplication17\MvcApplication17.Azure\ServiceConfiguration.Local.cscfg (if name of your app is MvcApplication17 :) )
and golfermessageboardpics is actual name of the blob.