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I found some cool (and free) placeholder RPG icons. The website is http://game-icons.net/ There are currently 2937 free SVG and PNG icons. You can customize the icons by changing the following features
Background -You can change its color and its shape from a predetermined list containing stars, hexagons, octagons…
Foreground- You can apply many transformations: flip (mirror), rotation (45°) or scale (zoom).
Frame- This input let you tweak the thickness of the border around the whole image.
Text- Type some letters in the “content” box to make a label appear over the icon. By default its position is centered but you can freely move it by dragging it with your mouse.
And more.
Thanks so much, and not @Rick_Davidson
Yep, “notted” 
It seemed like the time to make some icons. I’m going with weapon selection on the left and abilities/power-ups on the right.

I’m happy to share the icons if anyone wants them. They have a little green glow in the background for contrast and to match the UI bar colors.