I have two great friends who started the "No Time for Flashcards" series with their children last year which inspired me to do it with Adelyn this year since she turned 2 1/2 in September. We have made letters through H which are hanging in a line above our TV upstairs. I have not yet taken the time to get a good photo of our fun letters but hopefully I'll get that done soon so I can post it as well. A couple of weeks ago we decided to review the letters we learned by playing Alphabet Hide and Seek.
Hide and Seek is one of Adelyn's very favorite games right now so this was very motivating for her (and actually I still LOVE playing hide and seek so I also had a blast.) We picked a letter to hide and then we both took turns hiding and seeking the selected letter. I hid the letters in very simple and semi-obvious spots for my little toddler, to make the challenge achievable. Adelyn still has not correctly recalled all of the names of the letters we have made, like many two year olds, so this easy set up was great for learning the names of one letter at a time.
For older kids you could probably hide several letters, make the hiding spots more challenging, or even try to hide it on something that starts with the same letter (that may be for 5-7 year olds).
When you play just remember to set an alarm in case you lose track of the time :) haha. That did not really happen but we sure had fun!!