OK, so my plan is to build a fire pit on my back patio, but cheaply. I was thinking about using cider blocks in a square 2 block by 2 block and start with 5 blocks high. I was thinking about pouring sand to about 3 blocks in height, then leveling it out. Inside I want to use paving stones or small patio bricks in a smaller square to put a round charcoal grate from a kettle grill on to keep the fire elevated from the sand. I also have a cover from a prior fire pit to put on top to keep the embers from flying away. Also, I was thinking if it came down to it I could find a larger grate to put on top and would be able to cook on it. I was mostly thinking about this to have a a fire going while I sit out back and have a cigar and scotch. Most fire pits at stores run a few hundred, and I'm not concerned with it being decorative at this time.
Biggest concern is if cinder blocks can handle the heat from a wood fire. Also, if anyone thinks that something other than sand would be better to load in the bottom I'm open to suggestions and reasons for them.