I need to do MORE visible the ACTUAL data control

I't easy to put the color for diferent states of the dataset,
but I need (REALLY) see the ACTUAL control easy.
The caret (text cursor) it's so little.

Will be REALLY usefull put a NEW color for "ACTUAL" field
(at least while editing or inserting)

I try to change the color into the keypress event but the control
don't change his color, or recover the original once I press a key.

Somone knows a simple (or not so simple) way to change the color ONLY
for actual Field?

Thk very much!
Alejandro