I have thought about trying this with a paint that is made for making
faux-stained glass. It is available from hobby stores, but I have not actually
looked for it lately. I don't know how well it will handle heat.
Theatrical gel, will actually "burn out", that is, loose its color, and sometimes
shrink/deform from extended use. It is expendable. It is also not held directly against the "lamp"(bulb), but is usually in a metal frame, and not in direct contact with the lamp. It is also usually separated from the lamp by a lens, and sometimes metal components used for shaping the beam.
Still, the type of bulb you show, is usually low wattage, and if it does not get too hot, the gel will last a while.
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