I make mine up on the printer and laminate them... That way I can add all kinds of stuff to the plate... I like to do modern stuff on a Woodland camo background, or WW2 German on a Feldgrau background, WW2 US Army on OD, etc... The colors make the dio "jump out" at ya...
I can use different fonts as well, to "match" the nationality, and complimentary colors, yellow on OD, White on Feldgrau, etc... I only use plastic photo box-frames for dio bases, so the laminated stuff looks good on it...
Laminating costs about a nickle...
The pic in my siggy is the generic CAF background I use now, when I build one of the CAF birds... I put the name of the dio in the white area, aircraft in red. The actual label is 1x3"