Some ideas

1. You can take your classic skin and add clothes to it. I feel this because I have a great command block skin, but I want to add on a redstone coat onto it because I want to advertise my love for redstone. I want both, and I wish I was able to.

2. End dimension overhaul, adding tens, maybe hundreds new features, because a. We are bored by what it is now and b. It would be really cool to have new features to what now seems null. (Ideas: Acidic beaches, wood types, new mobs, etc.)

3. New nether features: a. New structures, like a sheep village people want. Idea is when you shear them, you aggravate the new golem, the quartz golem. Also new blocks for building.

4. Big portal in ancient city gets a use. IT'S A GIANT PORTAL! WE EXPECT IT TO BE USEFUL! (e.g. new dimension: the otherside.)