We don't have anything fancy, but am happy with all our shelters. Harvey built them all for me, except the one that's really a carport. That was installed, but he is the one who put the wood up inside of it.
We have one carport run-in shed (18x21), one wooden run-in shed (16x12), one three-stall barn (12x24), one two-stall barn (12x16) and then one 8x8 free standing stall connected to a 15x30 or so pen.
We also have an 8x4 or so "goat house" but that is not pictured. Harvey even made it with a deck on the back of it and any of you who have goats can rightly figure, they spend more time on the house than in it.
Here is my lean-to type barn - it has 2 stalls - a 10x10 and a 10x8 with a 10x4 tack area. Very simply construction. I leave the doors open usually and they can come and go as they please, but I do lock them up at night.