Albion has green, turquoise and blue healing potions (and red/violet/blue potions, that are dark orange, purple and navy blue respectively, for mana). Amulets & Armor it's purple/turquoise/grey. Earlier Vogel's games have weaker healing potions red and stronger turquoise (and the visually-related Realmz uses the reverse), though I think he later switched to using the round, orange mana potion icon for healing? NWN2 and Icewind Dale were blue too. Same for KotC2. And I recall seeing them blue in other games but don't remember where. Morrowind's color-coding was quality-related and on the greenish-blue side (but I think it was just the color of the bottle and not of the liquid?). Plus watery-purifying-good magic tends to be green/blue and fiery-evil-damaging magic red, if you want to attach some magical meaning to them.
Red=healing, blue=mana always felt boring/hack&slashy to me (and probably is some cargo cult involving diablo or wow). I'd say green potions alternating between healing, poison, antidote, stamina, regen, shield, and a myriad of other things in games that do rely on twitchy potion gulping, is the actual mildly annoying thing (with basic healing items you see/use them often enough that it doesn't matter how much they differ from what similar games may have used).