When you get to the website http://bighugelabs.com/ you have a number of options. Many of the options do not require joining any other site, but some do (i.e. flikr). So, do some experimenting before you ask students to try it out.
You can
• make a motivational poster
• Magazine cover
• Movie poster
• Trading card
• Captioner
• Billboard
These allow you to take an image and then through their simple step by step process you add additional text.
There also are some fun picture related tools including
• color palette generator
• bead art
To create the image you simply select which thing you want to do. I am going to show the picture captioner.
First select where the picture is. If it is saved on your computer, select browse and upload the picture.
You then can type in what will be in your speech bubble or thought bubble. Then when you click create, you are able to move all the bubbles around to create your image. You then can save it, edit it, or print it. 
