Dave Billing has recently released his enhanced port project Spawn to the public. The mapset is a multi-level hub wad utilizing many of GZDoom's advanced graphics features, including reflecting floors, 3D floors and dynamic lighting. I just played through this and it's definitely visually appealing, it also features a few new weapons and monsters from the repositories and is fun to play. Though I haven't been a big fan of the backtracking that makes a huge part of this, it's one of the cooler releases this year so far. I'd suggest trying it either way. You can find a download link, screenshots and further info on Dave's blog.