Thest links go to printable worksheets that can be used as supplemental material for children with "nothing" to do.
Rebus puzzles are fun and interactive for students Brain Teasers
A wide array of critical thinking worksheets to help stimulate the brain. Critical Thinking Worksheets
More Critical Thinking Worksheets
Fun puzzles for students being good. Picture puzzles, word searches and more
These can be complicated distribute these for kids who really need to think. Logic Puzzles