3/8 Pea Gravel: Typically used under playground sets, around stepping stones, as ground cover in gardens. 

7/8 Washed: Used for drainage areas or as decorative ground cover. Can also be used for dry riverbed.

1 1/2 Drain: Typically used for drainage with perforated pipe. Can also be used as ground cover or as dry riverbed.

River Rock 2 inch to 8 inch: The best one for dry riverbeds with the large variety of sizes.

Coarse Sand: Great for horse arenas, children's play areas, horseshoe pits, concrete mix. Many, many uses.