Here is one way to make glass spheres that contain diffuse glows, highlights, halos and specular reflections of the surrounding environment. An interesting feature is the extensive use of selection feathering and cutting.
The specular reflection is useful for large spheres because it helps to create the illusion of spherocity. For very small glassy balls (used for “buttons” and such) the specular reflection can simply be omitted.
The specular reflection is going to be achieved by mapping an image onto a sphere. Because of the way the mapping function works in GIMP, we have to start with a perfectly square image whose dimension is exactly twice the diameter of the glass sphere we intend to make. This tutorial presents just the basics and is meant only to be suggestive; almost every step I describe involves some subjective judgment, leaving plenty of room for experimenting and innovating.
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