Like this?

The reason I've put the gradient there was to simulate the icons in the original firmware:

We're completely limited on colors right now, so I decided to put it at the background of the top bar to give this feeling.
a1ex,
Ok, I'll try to think of something, can I double post this time (so you'll know I've finished them)? I'll make some icons and post here so people can do their suggestions.
Icon meanings:
- green/dark gray: on/off
- play-like icon: action (like.. take a screenshot)
- volume-like icon: numeric quantity (like ISO)
- dice icon: a finite set of choices (something that can't be disabled, you just choose from a list)
- red X: actively disable something that it's normally in Canon firmware (e.g. 5x zoom)
- rectangle around the icon: that item has submenu
- variable-size green dot: some quantity that suggests size (like magic zoom size)
- red dot: warning message (you need to enable something else to use this)
- a few less-used others like RGB/Luma, named colors...
While I was designing some icons on Photoshop, it decided to crash on me, so I'll make a description of my ideas:
Actions: Play-like icon, color (same as the menu highlight) when active, grayed out when inactive.
Numeric quantity/slider?: Volume-like icon, dark gray, menu highlight color indicating amount/volume.
Warning message (dependent on some other option): A grayed out circle with a X or / inside, and at the side maybe a "!" icon. Like this > (/)!
Switch (on/off): menu highlight color circle when on, grayed out when off. Alternativelly we might use a star or a tick.
Entry has a sub-menu: we can either put a small white play-like arrow on top, or bottom of the icon itself.
The other I didn't think of yet, any suggestions?