Look out---these sculptures are amazing! My 2nd grade students recently completed their sculptures using paper tubes and a lot of imagination. It took one week to build and two weeks to add the paint (we used acrylics). Day one I made sure to give out the primary colors plus black and white to encourage color mixing. The following week, I gave out primaries and secondaries. I love how differently each student approached his/her sculpture. The variety is excellent! We've received a lot of "ooooohs and aaaaaahs" already!