They were so simple! All you need is:
a roll of clear contact paper, paint brushes, paint (we used acrylic), fine sandpaper and masking tape. Go here: http://www.skiptomylou.org/2008/03/06/window-silhouettes/ for the complete instructions of how to make them. They were simple and easy - and Kaitlyn really loved it! Two recommendations: 1) cut the squares out ahead of time (I made mine 6x6) for each "egg" you make cut two pieces of contact paper. (You can get a roll of contact paper at wal-mart for cheap!) 2) once the paint is dry - flatten the squares with a heavy book overnight - that way they won't roll up on you!
The ideas for this craft are limitless! Spring flowers - Flags and stars - pumpkins etc. etc! I imagine you can use finger paints - but I used acrylic.
Enjoy crafty friends!