In Multicraft, navigate to Files - > Config Files -> Server Message From here you will be able to configure your server's message or MOTD. This server message can have color added to it, however it uses different color codes than Minecraft does in game. Here are the codes:
\u00A70 = Black \u00A71 = Dark Blue \u00A72 = Dark Green \u00A73 = Dark Cyan \u00A74 = Dark Red \u00A75 = Purple \u00A76 = Orange \u00A77 = Light Grey \u00A78 = Dark Grey \u00A79 = Lilic \u00A7a = Light Green \u00A7b = Light Cyan \u00A7c = Light Red \u00A7d = Pink \u00A7e = Yellow \u00A7f = White
Simply add the code in front of the text you'd like to be colored, save and restart your server and you're good to go!