3.25 X 2.125" Embroiderd Patch. The "Welcome to Colorful Colorado" Patch These signs have been cheerfully greeting travelers since the 1950s and there are 41 at various crossings around the state as you enter the great state of Colorado. You’ve all seen one. You’ve probably taken a picture in front of one. And you’ve definitely driven past one. What has become more of a landmark than a roadside sign is now arguably as infamous as the Rocky Mountains themselves. Each one of Colorado’s iconic welcome signs (there are more than 40 outlining the state) are handmade by the Colorado Department of Transportation in the agency’s in-house sign shop.