Is there anything I can do with a bunch of small rocks?

I just finished digging my lawn where I am going to put in a brick walkway. There were tons of rocks, and I collected up a bunch of them. Anything cool I can do with them??

simply stacking them next to small saplings can provide a "Heat Sink"
to protect the sapling from frost.
The rocks warm in the sun and radiate the heat at night.
It can also provide a habitat for lizzards and other animals that like sitting in the sun on hot rocks, they eat insects.

a pile of rocks can be a great place for garter snakes to live under...they love to eat the slugs and slug eggs.
if you had some water erosion from drain spouts or rain storms you could build up the area with the rocks

rocks are great for plants, they not only hold in heat but also condense the moisture in the air and drip it into the root zone..I like to place a rock near some more tender plants to give them the extra boost..

also some fruit trees really LOVE to have rocks around them, esp prunus

Brenda, I have a sack of brilliant white stones, sold for interior decorating.
I have thought many a time to put them around and in a pile next to a plant.
They will reflect sunlight but also cool down much quicker at night
so they may condense some water from the air, I'll test sometime.

I'm with the "snake pile" idea.    I have a lot of rock piles and my garden is always full of snakes, lizards, frogs, and toads. 

also there are all kinds of lawn ornaments you can make with rocks and mortar..I have a birdbath that has rocks all over it , love it, you can make walls, pillars, etc..as well..i wish I had enough rocks to make a wall..up by Traverse city Mich there is a home made of rocks, garage made of rocks, walls made of rocks and even some mosaics on the buildings..so cool