Another question about tool icons

The tools aren't visually distinguishable enough for these old eyes. They all have the same dull grey tones. I've managed to color a lot of them but some will not let me do so. One in particular is the tiny "lock ratio" icon. It's very hard to tell if it's locked or unlocked. I tried making setting it to medium but that changes the whole toolbar icons. I don't want the others to be larger. I tried paining the "appearance" but it reverts back to default every time. Even if I "save as defaults" 

Actually that is the only one that bothers me. I can't tell the difference between the locked and unlocked. Annoys the heck out of me when I go to size something and didn't realize the ratio wasn't locked. Annoyed me so bad that I made a macro and stuck it beside the lock icon. If I accidentally forget to ensure it's locked and I type in the value I want and it stretches proportionately I can just hit the macro and it will correct it. That's a "work around".

Anyone have any suggestions?