Animal housing? Need a use for outmoded bricks and blocks.? While putting up some fencing this week, I have unearth what...

While putting up some fencing this week, I have unearth what looks like the remains of an old-fashioned patio. There must be just about 40 concrete blocks (kind with the two oval "tunnels" through it- valid heavy.) and probably 100-200 bricks. Many are broken but plentiful are not.
We have goats, getting a Saint Bernard, chickens, turkey, and a rabbit.
I would approaching to take some philosophy on what I might use these bricks for. I would be open to research how to set with mortar, etc.
I am comparatively worried about something collapsing, hurting something.
Plans, websites and instructions or tips would be apreciated! or purely to brainstorm a bit.
Coving Question? How do you cut the stuff?
Answers:    Please, if you construct something using bricks and such, do it correcty with mortar. Keep drainage and drying factored in, and don't create a not detrimental place for unwanted critters.i.e. snakes, scorpions, spiders,etc.
My vinyl furniture your clothes,skin,etc stick to it...