Sam, unfortunately your icons have much the same problem as the existing ones: they're indistinct against the background. Particularly with indicator-messages-available-new.svg, indicator-messages-invisible.svg, indicator-messages-invisible-new.svg, and indicator-messages-invisible-mixed.svg.
This is not a hard problem. It is not necessary to change the shape or the symbols. Just have enough contrast inside each icon that its outline is clear against blue, black, and silver.
Sam, unfortunately your icons have much the same problem as the existing ones: they're indistinct against the background. Particularly with indicator- messages- available- new.svg, indicator- messages- invisible. svg, indicator- messages- invisible- new.svg, and indicator- messages- invisible- mixed.svg.
This is not a hard problem. It is not necessary to change the shape or the symbols. Just have enough contrast inside each icon that its outline is clear against blue, black, and silver.