Now that x86 binaries can be run, it's time to install Steam and play some games!
First download the SteamOS debian package from https://store.steampowered.com/about/ (it's the little Steam icon under the blue INSTALL STEAM button).
Then install the package:
sudo dpkg -i steam_latest.deb
Now you can run Steam from the main menu under Games. It will complain about some missing dependencies and a missing library. Don't worry, box86 is going to handle all of that, Steam just doesn't know it. In the terminal window you can push Ctrl+C to cancel the additional package installation. Let Steam update and eventually it will launch.
Sign in and take a look - things aren't quite right. That's because Steam is a hybrid of 32-bit and 64-bit pieces and only the 32-bit parts will work for us. That's fine, we just can't see some parts like the browser. Go to View - Small Mode to just change to a list of games. In the upper right, change to SteamOS + Linux to see the games you have that will work in Linux. This doesn't differentiate between 32- and 64-bit so not all of them will work. Check the compatibility list to see if anyone has had luck with a specific game.
Install a game and try running it - some will work right away, some need a few tweaks. Human Resource Machine is a great one that has no problems.
What else can be done?