I think 0.16's new alert icons are badly designed, both from engineering/safety standpoints (they're not recognizable/understandable at a glance, moreso for people with disabilities like colorblindness), and from graphics design standpoint (they're boring). This is my attempt to fix this.

The icons were vector-remade as proper signs with black border.
"No repair packs" icon had repairpack restored, because generic wrench is not indicative of "repair packs required".
Danger and Warning icons had exclamation sign changed to be more expressive.
Logistic Delivery icon (blueprinted module delivery by logistics robots) had construction robot silhouette on it replaced with Logistic Network symbol. Also included an alternate version using Module Mk3's silhouette, currently without configuration.

I'm unsatisfied with Logistic Delivery and No Storage Space icons, but I couldn't depict logistics robot for the former, and don't have a satisfactory idea representing lack of inventory space that fits Factorio for the latter.

LessUnplugged's way to replace the icons was used, as I found it to be sufficient and non-intrusive.

A screenshot with comparison of old vs. new is currently pending.