Create an image of your effect, put it in a GUI, and have the tool make the GUI visible at the wanted intensity for a few moments.
Don't need us to help you.
I dont want it to be a picture I want it to be like with real roblox effects.
Like this https://www.youtube.com/watch?v=baMVsx6blb8&t=3m02s but less blurry and and over saturation effect