See image gallery for crafting recipes.  All apples last 8:00, and they also stack, instead of refreshing.  (This means that, if you eat two of the apples right away, you get the effect for 16 minutes instead of 8, unlike normal apples/potions , which would just refresh/refil the timer back to 8 minutes).  Also, the new effects do work with the existing vanilla /effect command (ender = 50, navigation = 51, waterwalking = 52, slowfall = 53).

Diamond Apple

- Resistance I

- Health Boost V  (which adds ten hearts)

- Saturation I

Emerald Apple

- Absorption I

- Speed II

- Saturation I

Lapis Apple

- Haste II

Chocolate Apple

- Weakness I

- Speed I

Nether Apple

- Mining Fatigue I

- Water Breathing I

Bone Apple

- Navigation I

This is a new effect that causes a compass and clock icon to show on your screen.  Also shows a slimeball on screen if you are in a slime chunk (unless you are on a server where the world seed is hidden).

Ender Apple

- Ender Aura I

This is a new effect that causes ender pearls to do zero damage.  Also the ender pearls do not break, they drop on the ground where they land.

Clownfish Apple (added in 1.1.0)

- Slowfall

Prismarine Apple (added in 1.1.0)

- Waterwalk

Update 1.1.1: Config file added:

# Configuration file

##########################################################################################################
# effect_ids
#--------------------------------------------------------------------------------------------------------#
# IDs are only exposed to avoid conflicts with other mods.  Messing with these might break the game.   
##########################################################################################################

effect_ids {
    I:ender_id=50
    I:nav_id=51
    I:slowfall_id=53
    I:waterwalk_id=52
}


effect_tweaks {
    # This factor affects how much the slowfall effect slows down the entity. [range: 0.1 ~ 1.0, default: 0.41]
    S:slowfall_speed=0.41
}


general {
    B:apple_bone_enabled=true
    B:apple_chocolate_enabled=true
    B:apple_clownfish_enabled=true
    B:apple_diamond_enabled=true
    B:apple_emerald_enabled=true
    B:apple_ender_enabled=true
    B:apple_lapis_enabled=true
    B:apple_netherwart_enabled=true
    B:apple_prismarine_enabled=true
}


##########################################################################################################
# recipes
#--------------------------------------------------------------------------------------------------------#
# True means you have to fully surround the apple with 8 items, false means only a single item will craft with the red apple.
##########################################################################################################

recipes {
    B:apple_bone_expensive=true
    B:apple_chocolate_expensive=true
    B:apple_clownfish_expensive=false
    B:apple_diamond_expensive=false
    B:apple_emerald_expensive=true
    B:apple_ender_expensive=true
    B:apple_lapis_expensive=true
    B:apple_netherwart_expensive=true
    B:apple_prismarine_expensive=true
}

Requires Minecraft Forge version 1.8-11.14.3.1446 or higher.

CHANGES FOR 1.7.10 VERSION ( using forge 1.7.10-10.13.4.1558 ):
-Prismarine apples recipe takes Quartz Block input, since prismarine does not exist
-Diamond apple does not provide health boost or saturation
-Emerald does not provide absorption or saturation
-Removed bone apple and navigation aura