Agates.

I found both of these last week in the back field of our property. We had a few nice sunny days and I figured I better get some agate hunting in before the snow falls. The first 2 pics show a nice pattern and the colors are less common in the area. This rock weighs 4.2oz.
The last 2 pics are another common red agate, the picture's are not great but this is a nice solid agate weighing 5.9oz.