I didn't have a full set of blocks so I couldn't use their template, but I made my own cards to fits the colors/sizes that I did have and it was a HUGE success with our pre-school co-op. My 4 yr old loved playing with them for days after that pre-school lesson and his friends that have come over to play loved it as well.
Building with rocks...set up on a table and leave for children to manipulate.
Toddler Approved!: Alphabet Pocket Matching Game
Easter Bunny /// DIY Paper Plate Animal Masks
Rockabye Butterfly - lots of preschool activities and Letter of the Week activities!
Finger gym with an Easter egg theme.
Block Puzzles Busy Bag (31 Days of Busy Bags & Quiet Time Activities @ AllOurDays.com)