Back of E-Card

I, like some others, didn't quite understand the 3-sectioned e-card so I have added a sketch of what will now be my back cover here:

Since my card is about ways to help heal our Earth, my back cover will have a title of "Ways to Help" or "Ways to Heal" (haven't decided which one yet.)  There will be individual squares that will show pictures of ways people can help cut down on air pollution with text above them explaining what each image is representing.  I think it would make the most sense to have a pale green background with maybe a tinge of brown in a gradient effect behind the text and boxes as the color scheme.