What can I do with old chalkboard slate?

Got any grandchildren? I'd find a spot to hang a piece for them to draw on. You could also cut down a piece, frame it in and hang it on your kitchen door. Great place to run a grocery list on or use it for 'Command Central' space in your home to keep track of everyone's comings and goings. Not sure what type of saw you would need to cut it but I'm sure the employees at Lowe's or Home Depot could advise you.

I don't know about kitchen countertops. I wouldn't think they would hold up to the wear & tear. I think hanging them would be better. Or making an entire focal wall. Do you have a worksho? Great for drawing out ideas, listing materials, etc.

You could use them to make a table, or several tables maybe? Would be fun for guests to have a blackboard table to sketch on. Just an idea, not sure how it might work out practically speaking.

If you can't find a way to use them in your own home , check with local churches . Bible studies and religion classes for children would probably not turn them away .

Thank you everybody, for your suggestions. I think I'll be using some for a fireplace surround and hearth. And the rest for countertop. I've found a site that explains how to do it.

Put it in a child's room. Attach it to a wall in a child's playroom or club house. Great place for a grocery list.

I don't think it will holdup as a countertop. I would mount it on a wall.

If I had that slate, I'd likely just put frames around them, or cut them into smaller pieces and make chalkboards for pool tables, dart cabinets or make a bunch of sandwich boards for bistros board in your kitchen. Like weekly menu's.

You could also build a small pool table for kids.