http://www.bedford.k12.va.us/fms/lessons/

http://wiki.fcu.org.tw/index.php/GIMP:Lesson_Plan

http://www.tutorialized.com/tutorials/Gimp/1 On this one pick a category and scroll the page down a little the lessons are shown a little lower on the page. There is a neat one that looks like it is raining in the picture.