I've enjoyed learning about resources that I can explore more fully: Cacoo, Diffen, Kahoot, Tynker, and Voki. A fun little site that I recommend highly to students and teachers is Make-a-Flake by Barkley Interactive. Being an art teacher it helps students think conceptually in the circular format---which may be helpful to future artists but certainly if interesting and fun for just about anybody. The site takes a circular virtual paper and folds it. It lets the participant cut using virtual scissor directed by the mouse. You or your kids might enjoy it---especially on a snow day!
I like seeing teachers of core subjects utilizing creative sites to tap into that part of the brain. It makes it fun and wondering how a site like this can assist the learning in Math, Science, English, etc..