Add netherrack, recolored mossy cobblestone with red, orange, brown
Add nether quartz ore, white stripes on netherrack
Add soulsand, greener netherrack with two souls
Add glowstone, five bright spots, at least it looks ok from afar..
Add melon, striped alternating green/dark green
Add tripwire, nickel-colored zigzag line
Add trip wire source hook, like a torch with a loop
Add trapdoor, wood with four windows
Add TNT, 4x4 sticks of dynamite
Make TNT redder, and add label and fuse