Pea gravel is small, roundish stones of different sizes and colors, roughly pea to marble size. That makes a tricky building material but it does resemble round fieldstones or river cobbles.

There's a nursery that sells various rocks, where I've already bought several that are roughly bowling ball size. I also got one hand-sized chip. But there are shards all over the ground. I'm tempted to ask if they could quote me a price for a bucket or so of miscellaneous shards.