Ogórek and other 68,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
A cucumber is a straight line that slowly curves inward to make it end to a point but with a rounded edge that goes back around and curves. So it's both sides a straight line with a slight curve outward that is slightly rugged in nature. They curve back to meet on the other hand with small bumps all over it.