A contest

So CJ was doing some quiet time today. She typically reads books, plays with her dolls or something like that upstairs. I heard her walking, but being quiet and content. My Mommy Radar was going off, but I was in the middle of my quiet time with a book and hated to give that completely up. So after a few minutes I went to check. I peered up the stairs and noticed it seemed hazy, so I went up a few more steps. CJ got to clean up her mess, but can you guess what my expressive 3 year old used as her medium today? I'll send a prize to the first one to correctly identify the substance...and it won't be what was left in the container, I threw that away. The pictures do not show just how much was everywhere...and as a side note, I was a good mommy today and did not yell at all when I found the mess. I just handed her the supplies to clean it up.