Filters

1. Choose an image from the internet.
2. Crop it into 100x100px. (72)
3. Try 16 differents filters from the same image.
4. Create an image 400x 400 px. (72.)
5. Insert the differents images into the big one. 

Gimp

Do you know how to use GIMP?
Do you know how Crop An Image?

seach for tutorials in youtube, and post them in your blog.