I often create my own crossword puzzles and word searches for my science class. These can be assigned for homework but more often I use them as extra work students can do when they are done a test or quiz. If you type in "make your own word search" lots of different websites come up. I usually use the Discover Education site to make mine.
Three years ago I made test shields out of two taped together file folders (they have held up pretty well). Inside the folder I put the test/quiz and a puzzle. This keeps earlier finishers quiet and engaged while others finish up.