Hey Guys I found this contest and wanted to share it with you all. (https://pinshape.com/contests/3d-printing-kids-toys-design-challenge) Blender 3d would be awesome for this contest. I found it by chance. So if you enter, good luck. I know I will enter. 
Awesome. They want people to fill their model repository for them, so they can sell the 3d prints.
Better to hold your own contest, tell the entrants that you own all entries (standard practice) and then enter all those entries into the other contest. No work, lots of chances to win.
On the other hand, you could just be a good person and do yourself the favour of avoiding sites like that.
Here is my very feeble attempt. I am still fairly new to Blender and all things 3D but I am working on it!
Nice designs . All are looking wonderful to see.