On Paul's left wrist, he has the GC birds holding a banner that says "Thomas"

On the back of his left arm, he has "GC"

On his right forearm, he has an elephant from a painting by Salvador Dali. Click here to see the painting. Does it scare anyone else?

He has stars around his left calf.

On his right hand, he has a heart in between his thumb and index finger

On both of Joel's shoulders, he has an outline of a star.

Right above his heart, he has praying hands with "Benji" underneath.

On his left wrist, he has an outline of a star and "Truth" underneath it.

On the edge of his lower right arm, he has his last name, M-A-D-D-E-N.

On the back of his upper right arm, he has an Irish flag.

On his lower right arm, he has the face of Jesus.

On his right wrist, he has an outline of a star with "Hope" underneath it.

On his right calf, he has a dragon.

On Billy's left shoulder, he has the GC birds holding a banner that says "mom".

On his upper left arm, he has a horseshoe with a star inside a heart inside it.

On his lower left arm, he has five black stars.

On his lower left arm he has a sunflower.

On his upper left arm, he has a toy soldier.

On his left elbow, he has a nautical star with clouds inside of it.

On his lower left arm, he has Jack from the Nightmare Before Christmas with crossbones and a spiderweb behind it.

Above the star on his left elbow, he has a spider.

Here is an over view of Billy's arms. 

One his right arm, he has Jack from the Nightmare Before Christmas.

On the left side of Benji's neck, he has the Virgin Mary.

On his upper left arm, he has a skull and crossbones.

On the top of his lower left arm, he has the last supper.

Underneath his lower left arm, He has a dagger.

On his lower left arm, a world on fire.

Lower left arm, a scroll with writing.

On his right shoulder, he has a crown with "mom" underneath it.

Underneath his upper right arm, he has a nautical star with "Benjamin" above it.

On the back of his upper right arm, he has the Irish flag.

Upper right arm, a bunny with a cross on it's chest.

On his right arm, he has a graveyard with Jesus in it holding a lamb.

On the front of his neck, he has a heart with flames around it and I am told there is a key hole in the flames over his voicebox.

On his left knuckles, he has M-A-N, and stars on his pinky.

On his right knuckles, he has M-A-D-E. This pic is an overview.

On his right hand inbetween his thumb and index finger, he has stiches that he got with his friend Brian to signify blood brothers.

On his upper left arm, he has "cash", for Ca$hdogg

On his upper right arm, he has a wagon. Ok, significance anyone?

On his right elbow, he has a skull inside a flower.

On his lower right arm, a man holding balloons. Just a little creepy.

I was told the number 21:1 - it's a bible thing.

On each side of his chest, he has a GC bird with "Sarah" under the right one for his sister, and "Josh" under the left one for his brother.

Here is a hinge. 

On his left shoulder, he has one of the GC emblems with the Irish flag as the background.

On his upper left arm, he has brass knuckles with a knife going through them. Underneath he has "punx" and underneath punx he has "take it to the streets". Above the brass knuckles, he has "east coast"

On the inside of his left arm, he has a nautical star with "Joel" above it.

On his upper left arm, he has what appear to be bats.

On his left elbow, he has a spiderweb.

Above the spiderweb, he has "GC"

Here is an overview of Benji's arms.

This is Benji's "Bands Leg" He has "GC", "Rancid", the Minor Threat sheep, MxPx, and a NFG tattoo.