I tried making a KS-themed Minecraft world too! So here are the answers:
1. All colors of concrete. I love concrete because the colors are vibrant, there’s no marks, and it’s durable.
2. Probably oak or birch. Oak because I’ve seen it a lot and birch simply because it looks cool.
3. Definitely the spawn eggs and spyglass. I’ve loved spawn eggs ever since I’ve started playing Minecraft (and that’s 3 years ago) and the spyglass is very useful for spotting references to www.EloquentPeople.com.
4. I like most flowers, but I can’t remember what half of them look like. So I’ll just say lily of the valley.