To be honest, my biomes are fairly small (20 by 20 max). And yes, I am using a plains biome. (or at least the edge of one) I think I am going to rebuild my biomes somewhere else, maybe on one of the mushroom islands I found. (finally)
One of the most fun buildings I ever made was done up to look like the nether on the inside. Once you walked through the doors you'd swear you were in the nether, complete with lava pools and quartz ore and a couple named zombie pigmen in cages.
I just scrapped all my old survival worlds and started a brand new survival world. My goal is to do things the right way this timeinstead of always making mistakes and messing things up! So far I have fenced in some cows and sheep, built a blaze grinder (only died twice building it!), and started taming the ocean monument that was right next to the survival island I spawned in on ( See thread Smallest 1 Tree Island I've Ever Seen for seed). I'm expanding the island by building a platform at sea level.
I haven't found a village yet, so I'm also preparing to cure some zombie villagers after I clean up the ocean monument, which will probably take me several more days of trips to the desert for sand.