Not a good idea imo. Because enhancements level codes (for SOs etc) are even level = white, lower level = yellow, higher level = green and not useable = red.
Since IOs actually never level and change their values they are fine as white imo. And if you cannot use em (aka they're more then three levels higher then you) they're red.
That's fine and dandy, but when you have lots in storage to sort through being instantly able to see those that offer less benefit than the best you can use would be handy too.
And because the numbers that actually show on the IO (unless you have your UI scale at 100%+) are generally too small to read easily.
Currently all usable IOs are coloured grey. Suggestion make those IOs that are of your immediate level (eg +3) White/Grey and those that are below your level (eg -3) green. Rather than actually making the values mean anything... they're IOs it doesn't. But it would make it easier when sorting through storage to see instantly what can give the greatest benefit at your level.