You can have the students explore, extend, and record growing patterns (functions). They can use pattern blocks to make the patterns, then record them on the an algebraic representation page (attached). The site below has some ideas, or you can google "growing patterns". If you have any Marilyn Burns/Math Solutions resources, there is more information there. It is easily adaptable to different grade levels depending on the patterns you choose. Students could also make their own patterns.

http://mathwire.com/algebra/growingpatterns.html
You could also make concentration (matching) games easily with many topics. For example- integer operations- type integer problems and answers on cards for students to match up. You could do geometry vocabulary (word-picture), or one-step equations (problem-answer). This site was recently posted in another thread- it has templates for making cards- very handy.

http://www.donnayoung.org/homeschool...game-cards.htm