At the current time editor of the particles has an outdated icons set. And the solution is to create a new icons set (Kaetemi style).

• collision zone item
• emitter item
• force item
• light item
• located item
• instance item
• particles system item
• not loaded particles system item
• sound item 
• workspace item

Icons should be submitted as image file (e.g. PNG) as well as in the original (preferably SVG) deisgn format to enable easy modification if required. 

Icon images should be 64x64 with a transparent background.