I am using the sky control. It probably not the latest version but I am using the 6 images in the sky control to produce the background.
It's a good idea about adding a "customise" option for the sky control. I'll add that to the ToDo list.
If you have any good sky control images then as long as they are not copyright then send me a link to them and I'll add them in the next release.
Regarding, other players. You can click on OPEN GAMES in the lobby which will show any games that are waiting for a player to join.
As it's very new there are only a handful of players at the moment. Please do help spread the word so we can get more players joining in.
If you start a game and select WAIT FOR ONLINE PLAYER then it will appear in OPEN GAMES for someone to join.
I'm currently working on an AI Checkers player that will join online players' games if no humans are around.
That should be ready in a week or so.
Thanks for the feedback and please do help spread the word.