I keep my saddle and one pad on a saddle rack in the tack room- I have one hook under that for my bridle and I do keep a couple of extra bits there. Each horse has a "cubby" in the aisleway in front of the stalls, so my grooming box (with every tool, shampoo, conditioner, etc.) is in there. My husband built me an extra little shelf in there so that I have two "levels" to also contain fly spray, basic meds (vetiricyn spray, thrush remedies, etc.)- in the winter, things that will freeze either come home with me, or go in the tack room medicine cabinet. We have blanket bars in front of our stalls, so I have a cooler and one blanket hanging there. Halter, lead, and flymask on a hook on the stall door when horses are in for the night.
The tackroom is locked when everyone leaves for the day, but not during the day and nothing is locked up inside. Cubbies are also unlocked. So far, so good, no trouble. Flyspray does sometimes get used, and very rarely I'll see my lead being used on another horse, but nothing is done maliciously and it's no big deal.
That leaves me with an assortment of odds-and-ends in my house and car: unused bridle, pads, halter, leads, flymasks, grooming tools, and blankets in the off-season. However, I think I just found a beautiful lightly used wooden tack trunk, which is pretty enough that it can hold all my random stuff while also sitting out in my house, so I'm pretty happy about that. Fingers crossed it will be as nice as I'm hoping when I go pick it up tomorrow!