Give the children good materials
Here, quality marker and good thick sheets and see what happens! Here, the adult has first drawn a proposal for how such an Easter egg with patterns might look.
Some would say that this kills the children's initiative. These pictures disprove this. Fortunately, the children (these are pre-school children) wanted to create their own Easter eggs. And they turned out really nice!
When we have activities like this, we practice "joint focus" even if this was not a planned activity, but something that arose spontaneously. Being able to receive joint instruction and then work purposefully is something that comes in handy when the children start school.