They can be stacked like Lincoln Logs and glued with Elmer's glue to make houses or just a box. We did it in VBS when I was young.
There are several different ideas posted by Hometalk members. Try this link
I like the hexagon shelves myself - like this one. They are unexpected. Wishing you the best.
Hi Gha: Check out Pinterest, they have a zillion ideas: https://www.pinterest.com/search/pins/?rs=ac&len=2&q=popsicle%20stick%20crafts
I use them when Iplant seeds to mark the spot. Put the name with sharpie on the stick to identify the plants