Just a thought: get some decal sheets from Micro-Mark (They are available for inkjet or laser printers). Make your own signs on your computer, change them to the colors of lettering you want, cut out logos, advertising pictures, photos, etc., modify them to the size you want, scan them onto your printer and have a ball. You can put them directly onto walls, windows (they look great on transparent windows), trucks, bill boards or whatever, or you can put them on styrene signs of any size or shape and glue them where you want them.
You can even use translucent plastic for the backing and light them from behind.....and it is fun and unique. Make as many as you want in almost any size you want.
A good print shop can make them larger or smaller than you can on your computer, too.
