I think this is an adorable way to craft and create with plastic bottle caps! Visit Love and Lollipops for more pictures of these Dr. Seuss-like structures.
Alphabet Glue has a special summer issue featuring four different science projects with companion book reviews! It's at a special price too so click on over and add a little science fun to your summer :)
Building with recylables is a great boredom buster and good for groups of kids of different ages. Check out this example, featuring colorful tape, at Elsie Marley!
A Life Sustained shares a simple way to convert a large plastic box into a standing rice play table! I think this same method could be used for lots of different things so be sure to check it out and get inspired!