It's no doubt that Berry Juice, Eviolite, Choice Scarf, and Life Orb are the most common items in LC, but are people really trying out as many items as they can? Something that's quite interesting is type-resist berries, which actually see a reasonable amount of use in other tiers, but not in LC, usually because Eviolite is usually better, but it can have some nice uses. TCR has used Amaura with type resist berries, which allows it to effectively lure out fighting/steel types well (depending on which berry it has).
Band/Specs are viable items which do help with certain calcs sometimes, and are really cool on Pokemon that get trick/switcheroo, such as corphish or binacle.
As for other semi-common items in other tiers, I never see lum berry in LC, but it always seems like Eviolite would be a better choice.
Air Balloon is another interesting item, TCR came up with an Elekid set that used Air Balloon and thief, which makes Elekid really hard to deal with initially.
But at the end of the day, Eviolite and Berry Juice outclass most of these items, because other items are situational, whilst Eviolite+BJ aren't and are useful in any battle, making other items a waste of time, especially in ladder play.