3D Platonic Object
First off, select add floor object from add light object.
Now go to objects>>primitive>>platonic. With your mouse, drag your object above the plane.
In the materials window, go to file>>new material. Change the colour to whatever you like. I chose green. Check off the box beside reflection. Click on reflection, and set the brightness at about 25%. Check off the box beside specular, and use the settings below:
Drag you material to your platonic item under the objects window. Make another material of a different colour for the background. Hold down the add light object button, and select the add light object button.
In the attributes window, under general, set the shadow to soft. Create another light and place it on the other side of the object. Go to render>>render settings. Set the antialiasing at best. In the multi-pass section, check off enable multi-pass rendering. Hold down the channels button and select add all. In the output section, set the size at about 475X360. Now go to render>>render to picture viewer. You're done! Here is the finished image:
Or, you can use the same steps with a sphere instead of a platonic object: