The Magnolia State.

Remember when Mississippi had the Magnolia auto registration plates? Well I think the state ought to model its route markers after it. In my suggested scheme, the surround and numerals are blue, and the magnolia is a green, yellow and grey watermark. I think it would be great for tourism.

One and two-digit.

And three digit. 

(1xx 3-digit signs can be a little bit narrower.)

Smaller versions at RV Droz's website.