The player.setGlowing(true) method can be used to enable / disable the glowing effect for any player
The default glow color is white, but this color can be changed using Scoreboard Teams
First, obtain a reference to the main scoreboard using Bukkit.getScoreboardManager().getMainScoreboard()
You must set this as the player's scoreboard using player.setScoreboard(mainScoreboard)
Next, use the main scoreboard to create a team using mainScoreboard.registerNewTeam(ChatColor.BLUE + "team")