I am also looking for the icons that used by Visual Basic .net. It must be stored in some place.

You can make your own bmp picture (size 16*16 pixel) and insert them as menu icons or context menu icons.

The only thing you should be careful is the edge of these pictures. you can paint the edge of the picture to some color, and then in vb.net set the transparent color of that controls as the same color you used.