There is a simple technique now that all of have our own colour printers. Simply buy a few sheets of blank clear decals as used by modellers. Either make up your own labels or copy them from somewhere on the net and simply print them onto the decal sheets. Cut them out and apply. Alternatively use clear self adhesive sheets. Although I would think decals might look a bit more professional and last longer particularly if you varnish over the decals.It's very inexpensive. Here's a link which I googled just now. I'm sure there's others:http://www.micromark.com/Decal-Paper-Try-It-Pack-for-Laser-Printers-and-Copiers,9056.html
You could get some vinyl letters cut... or peel and stick.would be even cheaper.
Weed is the stuff you usually throw away when you cut vinyl lettering