looking for small rectangular stones/rocks any idea where to buy this???

[Steve Peterson]

What about cutting a piece of slate with a tile saw? Cut 1" strips in one direction and 3/4" wide the other direction.

[dustin wassner]

I am going to try to make a mold. Watched a few videos, and I think I can do it.

Next question:

what material should I pour into the mold that will take abuse from the kids without breaking and is still affordable? grout/cement/mortar?

any thoughts? thanks so much.

[Mel Fulks]

There are a number of products used by pattern makers and such that consist of two parts that are mixed and then set up quickly. I would pick one that's paintable and cheap.