Forget the paper
In the past, we've been used to testing students' knowledge on paper and trying to find ways to make our worksheets a little more appealing than the usual question and answer format. I have spent many hours devising word searches and crosswords in MS Word—or making two columns with pairs of terms for my class to draw lines and to match up the correct pairs. You can do this, unless you want to kill time by getting the students to copy out all of the words in the columns, or draw the crosswords in their exercise books. However, the sheets are of no use once they've been written on. So forget the paper!