Whilst, (not a Brit, just love using that word) teaching in a self-contained classroom; I am often forced to teach Art. I use the word forced because my knowledge of Art is drawing Stickman. These are some websites that I use to help me overcome my limitations.
K-6 Elementary Art Lessons - The Art Kids
Elementary Art Lesson Plans
Elementary Art Education: Arts & Crafts, Art Projects - HomeworkSpot.com