Home Fire Pit Diy . Of course, another alternative to using brick or stone is using reclaimed concrete blocks. $50 fire pit using concrete tree rings from instructables. DIY Fire Pit under 100, all materials from Home Depot Diy fire pit from www.pinterest.com (see below for a shopping list and tools.)subscribe to this old house: And a cubic yard of coarse concrete sand,. You can use cinder block to build a small fire pit in your backyard.