The leprechaun left behind his hat and a gold coin. Practice spatial concepts/prepositions of where the gold coin is with these simple pictures. You can even buy your own hat and coins (I found these at the dollar store) and have the students manipulate the objects to practice these spatial concepts.
Working with preschoolers I try to incorporate quick short songs to keep the kids engaged, and after a couple repetitions, some of them even start to sing along (which is great for us Speechies!). You may want to sing this for each preposition you target:
(To the tune Twinkle, Twinkle Little Star)
Lucky Leprechaun forgot his hat
Let's see where the gold coin's at.