Throwing down some saplings and doing the standard bonemeal spam is fine, but if you want to take your builds up a notch, doing the trees yourself as well can be utterly transformative. It doesn’t have to be anything fancy or complicated. Even small trees that are just alternatives to the vanilla ones (like those pictured) are fantastic.
Trees, like any organic shape or structure, can be tricky to get the hang of in Minecraft’s blocky style, but they’re well worth the effort. With a bit of practice, you’ll be sprucing all your builds up with handmade arboreus in no time!