May be a fun project for Haiti preschoolers? Grow a Lima bean in your window. While this is not really a craft project, it will still be something fun for the kids to do. Once the bean starts growing the kids could always paint a nice pot to plant it in.
science Rock Cycle - When picking rocks for hardscapes use Metamorphic rock, especially with water (so it doesn't leach anything into water) also important to know what type of rockscape animals may have evolved in.