I happened to just come across this activity by accident while I was looking for certain letters in our sticker bin. My boys wanted to help so they were right by my side looking for letters and were even making it a competition of who could find the letter I was looking for. 

Since this “game” was so fun I decided to lay the letters out on the table with a magnifying glass. They had so much fun being “Detectives” while playing “I Spy”.

For a more challenging activity you could ask your child to find a green M (using both colors and letters).  Any letters you have in your house or letters written on a paper works too!