Here are some home-grown activities.

LunchBox Math - just a byte

 Eratosthenes Sieve
 Tangrams
 Pretzel Puzzles
 Gaussian Elimination
 Polygons 1
 Polygons 2
 Pi
 Nim
 Probability of Coin Tosses
 Probability of Dice Rolls
 Messy Data
 A Donkey Mystery

Linear Transformations, Systems of Linear Equations

 Proportion, Scaling, Linear Transformations
 Proportions in Egyptian Art
 Proportions in Greek and Renaissance Art (Golden Section)
 Proportions in a Barbie Doll
 Enlargement Activity - Wildcats Image
 Powerpoint of linear translations - tesselations presentation. (to view the show, download and play)
Minutes: Introduction to Linear Tranformations, Scaling and Proportion
Minutes: Stump the Chump with Systems of Linear Equations
Minutes: Underground Railroad - Linear Scaling 
Minutes: Linear Tranformations: Rotation, Translation, Mirror and Glide (art from M. C. Escher)