PrintShop (iPad app). This is a fun app. Available for FREE for the iPad and Droid tablets.
Thingiverse on the web (apps for iPad, Droid).: This is a website create by MakerBot. It's purpose is for sharing of 3D models. It is fun to explore...literally hundreds of thousands of designs from people all over the world.
You will need to create a free account.
Here is a link to the 3D logo for Grove Elementary
TinkerCAD: If you want to create your own 3D models, this is a great way to start. It is an easy-to-learn design system that is completely FREE. Nothing to download and runs in your computer's browser. There are lots of learning aids. Get started here.