Facebook Marketplace has been the single biggest antagonist to my “live minimally” lifestyle - there are so many things there you can get for free.
A free white school cubby (5ft by 3) was perfect for our shed - propped up against the wall, with lower cubbies being good for things like boots (a milk crate fits perfectly in each cubby) and medical supplies, and uppers being good for folded blankets.
Found a free antique hutch with large glass facing doors; weatherproofed it and turned it into a plant terrarium with grow lights (“upscale plant jail”) for the houseplants - keeps the housecats out of them. Then when I got free FB bakers rack, swapped the plants and lights over to that and now the hutch is a fancy liquour cabinet.
I recycle the zipper plastic bags clothes come in if you shop online; those are perfect for holding a single bridle, or leather goods. Also always keep the silica gels, which get chucked into my tack trunk and other areas.
About ten years ago for Secret Santa on COTH I got a beautiful quality black/white patterned woven wool saddle blanket… The horse it was for has since passed away - I washed the much loved saddle pad and it now looks sharp as a statement piece on the cedar oak chest I have in the living room (added plus, the cats think it is their personal blanket…).
People are always giving away three or five tier shelving units – those are an absolute godsend for organization in a barn. I have a bunch in the grain shed for supplements, buckets, etc. And the rest are good for blanket and saddle pad storage.