Sandcastle from boxes and mod podge

I've been helping my sister in law with the decorations for her daughter's fifth birthday party.The party has a mermaid theme and for months I've been pinning ideas on pinterest.One of the ideas I pinned was a mod podge sandcastle.
This is my version of the mod podge sandcastle made out of three different boxes, a produce container and an old dog food tin.

I also used a mix of sand, cornstarch and water to make some sand shapes that I glued on to the castle.

These are just a few details from the party.  Stay tuned for more!