I have been studying Hundertwasser with my second grade classes. So, I picked out a few of his art pieces that we would recreate. The Blob Grows in the Flower Pot was one that everyone seemed to like, but there's a but. The faces in the images seemes to creep out most of the kids, I get it.
The end result looks more like lollipops in a mug, than flowers in a pot, but I don't think the kids minded that either. These pieces took us 4 class periods to complete, but... this is a really large class (32 second graders). Not to mentions they pack up their things, then come to art class right before they are dismissed for the day. So, I would normally say this is a 3 day project, unless you are over crowed like we are, then plan for 4 art days.