I'm glad I scrolled to the bottom for this

I'm doing the same thing sort of with some old concrete rubble. Making a small hill/mound for a raised herb garden. If you want to get really fancy, you can use that sort of stuff for a base for cob structures like benches or pizza ovens etc. Just be aware that thing may settle wherever you bury. The brick will degrade with time and whatever you cover it with will fill those voids. Common sense thing you probably thought about, but it's worth noting.

I'm playing Sekiro right now and I really needed to hear this.