This past weekend, I participated in Maker Faire with my student roller coasters, and taught kids to build with business cards (index cards work well too).
diy.org and showed kids how to build the cubes and connect them. I did bring one of my daughters to help since it was Saturday. I only had a few students come because of end of the year recitals and tournaments, but one student stayed at the booth for a long time so I could walk around. I was thankful because it was also a FANTASTIC networking opportunity.
If you aren't familiar with the Maker Movement I really hope you spend some time looking into it this summer. It really fits in with PBL and extending learning - and is allowing students to be creative with science and math.
**** Thank you Ms. Hedrick for taking pictures****