I've got a really big Boots suggestion here that involves reworking T2 Boots and reintroducing T3...
Aight so here it is.
TL;DR - All Tier 2 Boots cost 1100g, provide Enhanced Movement, a simple stat, and a Unique Passive. Tier 3 Boots Enchantments are reintroduced, costing 450g and granting special movement benefits that all champion classes can tap into.
The stats below are what this rework of Boots might look like. With 8 options for Tier 2 Boots and 6 options for Tier 3 Enchantments, there would be 48 combinations of stats and passives to cater to champions and playstyles of all kinds. So, what do you think?
#Tier 2 Boot Upgrades Cost a total of 1100g across the board (800g to upgrade from Boots of Speed).
Mercury's Treads
+25 Magic Resist
Unique Passive: Reduces the duration of crowd control effects by 30%.
Enhanced Movement: +45 movement speed
Brawler's Boots (Renamed)
+30 Armor
Unique Passive: Reduces the damage from basic attacks by 12%.
Enhanced Movement: +45 movement speed
Berserker's Greaves (Reworked)
+20% Attack Speed
Unique Passive: Every 6 basic attacks is granted double Attack Speed for that attack (counter is reset after 2 seconds without attacking).
Enhanced Movement: +45 movement speed
Oppressor's Treads (New)
+15 Attack Damage
Unique Passive: Basic attacks steal 10 Movement Speed from the last enemy champion hit for 2 seconds (halved to 5 movement speed for ranged champions).
Enhanced Movement: +45 movement speed
Sorcerer's Shoes (Reworked)
+10 Magic Penetration
Unique Passive: Refunds 10% of mana spent.
Enhanced Movement: +45 movement speed
Lucidity Shoes (Renamed + buffed to match increased cost)
+10% Cooldown Reduction
Unique Passive: Reduces the cooldown of Summoner Spells by 15%.
Enhanced Movement: +45 movement speed
Swiftness Tabi (Renamed + buffed to match increased cost)
Unique Passive: Reduces the effects of slows by 30%.
Enhanced Movement: +60 movement speed
Boots of Mobility
Removed in favor of being a Tier 3 Boot Enchantment.
#Tier 3 Boot Enchantments New and reworked. Cost 450g across the board.
Mobility (New) Unique Passive: Grants +55 out of combat movement speed.
Furor (Reworked) Unique Passive: Grants +15 movement speed in combat.
Alacrity (Reworked) Unique Passive: Grants +35 movement speed for 5 seconds upon entering the radius of a friendly tower (once per tower, refreshing upon entering Fountain).
Retrieval (New - replaces Captain) Unique Passive: Grants +35 movement speed when moving towards allied champions and friendly towers (800 range).
Exploration (New) Unique Passive: Grants +55 movement speed in brush, decaying over 2 seconds upon leaving.
Distortion (Reworked) Unique Passive: Grants +115 movement speed decaying over 3 seconds after casting a Summoner Spell (occurs after Teleport Channel in the case of Teleport).
#Cassiopeia
Passive gets buffed to make up for lacking access to Tier 3 Boot Enchantments.
You are not forgotten.