Number Loving is a great math resource from Laura Rees-Hughes and Sharon Derbyshire. It is a very simple and elegant website that is easy to use. It has many topics ranging from algebra, geometry, number sense, and statistics. The resources are phenomenal they range from quizzes, activities, starters, investigations, and review games for all levels across the math curriculum.
I would definitely try to find your next lesson here: http://numberloving.co.uk/resources.php
There is also the Number Loving blog that includes top-notch ideas to spice up math lessons. You can find new approaches and alternative math material or your classroom. Here: http://numberloving.com/