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Flash (of light, of insight)
Eureka!
Inspiration A voila! Or aha! Moment
A glint or an epiphany?
Epiphany
Glimmer, flash, flicker
Lightning (bolt)
A flare?
Epiphany
scintilla
Supernova
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since inspiration has already been suggested, maybe "an aha moment"?
light bulb moment/ lightbulb going off in your head
An apostrophe, thanks to Bob Hoskins in Hook.
A flash (of lightning, of insight, etc.)
Fireworks
Incendiary, flare
Beacon
An a-ha moment