Ideal follows a very consistent color scheme. Grey outside, yellow instrument face.
Fluke also follows a very consistent color scheme. Yellow outside, grey instrument face. The only exceptions appear to be instruments designed for very specific environments where you want to be damn sure your meter isn't going to cause an explosion, which appear to be red on the outside.
If you showed me 50 meters from those two companies I'd have no trouble telling which belongs to each based on the coloring scheme.
All you seem to have shown is how exact a copy the sparkfun meters had to be to run into trouoble, because something as trivial as inverting the color scheme is enough to avoid it.
So I give up. What was the point you were trying to make?