I noticed this at greenmarket2warp: Shouldn't there be the green glass on the left of that sign, and glowstone under both? This is the same for both bluemarket2, redmarket2, and greenmarket2. That's what the yellowmarket2 warp has. Also, a suggestion to make it look nicer, place a [Warp] Market sign on the other side of all market2's also. EDIT: Picture of all other markets Spoiler: YellowMarket2 Spoiler: BlueMarket2 Spoiler: RedMarket2
This should be a stone slab, but as I can't make warp signs this will have to be left for @Physicistsmom to fix.