Well, the only kind of horses we've ever kept at home have been minis, so all our "stuff" is set up for mini size horses, but none of it is very creative.
Our two little barns have stalls that are "mini" size 8x12 w/ pipe gate doors:
Our run-in sheds are an 18' x 21' three sided metal carport that we lined with wood:
and a 12' x 16' normal kind of wooden run in shed (8' tall at the highest part)
Our round pen is "mini" size being about 40':
I have a smallish pen w/ an 8' x 8' stall I can use for sick horses or to confine one when need be. It shares fences with one horse lot, the goat lot, and our dog kennel. Actually, I put our two "big" dogs (lab x chow and blue merle collie) in this small pen with the gate to the kennel left open so they can run in either fenced area, go in the 8x8 stall, and into the stall H made for them in the storage shed, which is one side of the dog kennel.
Also, our fencing is "mini" safe in that we've used cattle panels on oak posts for most of it, and some of it is still heavy guage field fencing on oak posts. We found that the lighter guage field fencing, even though we stretched it TIGHT did not really hold up well. I like this kind of fencing because it keeps out most dogs (not that I've seen any strays, but still...)
For feeding the horses, we have 8 quart flat back buckets on the fence and in the stalls. For watering, we have 55 gallon long / low troughs and one 25 gallon low trough for warm weather and for winter time, we have 4 16 gallon blue electric heated water containers that look like muck buckets.