Glitter brush that actually glitters when your picture is finished and published
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      Tonia Helms commented Nice idea but impractical as it would require animated textures via code, even for a seamless procedural texture, it would slow and increase app/ file size for a what is ( no offense) essentially a gimmick. 
 It's a colouring book app.
 I'd suggest a cinemegraph app like plotaverse / motionleap / werble ( or countless others) if you have your heart set on animated image effects.
 All the best.