I know most of those suggestions aren't SG related, but he said they also want to make maps for other games too. I did read the thread so please don't say things like "Did you read the thread? Cuz he asked for SG maps...
Landscape - Hungergames
Landscape would be pretty easy to make, and it is easy to play. It would be a flat world with things like haybales, a lot of trees, little mountains, farms...
Roads/Traffic - Hungergames or Skywars
I think traffic would fit better, because the main idea behind this was to make a big city with a lot of traffic and stuff, you can add little shops where you can find chests, things such as underground sewers, secret mineshafts...
Vegetables - Minerware
The platform would be green and the little blocks on top of it would be red. The surroundings would be all kind of vegetables such as carrots, broccoli, tomatoes,...
China - Hungergames
If this gets added on of the main thing I want you to add it to make the Chinese wall with Donald Trump behind it :P
Also those pink trees would be cool and all kinds of things that are related to China.
Prehistory - Skywars
Every island has a rock like Patrick from Spongebob has, you will have a wall with weird symbols on, like the people did in the prehistory. Campfires and little farms with sheeps would be a nice feature.
Hogwarts - Hungergames
The title explains it all, just make Hogwarts. Yo maybe spawn in the main hall, and from there on you can go wherever you want, since Hogwarts is huge. You can go in libraries, different potion rooms, bedrooms, and if you add secret rooms that would be insane.
Beach - TNT Run
You can choose how the platform is going to look like, but the surroundings could be beach/summer related. Things like bucket filled with sand, waves, sunglasses,... This indeed looks like Pirates, but if you give it a magic touch I think they both could be way different.
Themepark - Hungergames
This is my favourite one! You spawn inside a themepark surrounded by little candyshops and toyshops. You have little pathways that lead you to different attractions. It could be nice if you could use some of those attractions though, but I think a lot of people will use the attractions instead of killing each other :D
I'm definitely going to add more maps once I get more ideas.
Edit: I removed the lucky islands map sports, because it would be the same as Skywars sports.