These are really cute - would be easy to construct, too, with folding of circles for motor skills - not sure if they're just patterned paper circles or cupcake cases, but either would be fine.
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DIY Paper Strip Easter Art- such a good idea for any shape.
A super simple Easter craft: Paper plate chick. Great one for young children and toddlers with supervision. Easter Crafts for Preschoolers: Top 20 Toddler Easter Crafts