I've been working more fervently with my older preschooler on sight words now that "mommy school" has started again.
Here are a few of the things I have done to help him learn his sight words:
Dotting each sight word with a different color.
Playing tic-tac-toe with the sight words.
Parking lot - cars cover the sight word.
Coloring - I found a black and white clip art from My Cute Graphics (it's free) and printed it off. Then I wrote his sight words in the spaces to color.