Thank you for sharing your shader effects! Not that many joined this community challenge, but those who did submitted some nice looking stuff!
Pixel Art Shader
by @selimanac
HTML5: defold-pixelart-shader-example 1.1
HTML5: defold-pixelart-shader 1.0
Source: GitHub - selimanac/defold-pixelart-shader
Rain effect
by @NaakkaDev
HTML5: community-challenges 1.0
Source: GitHub - NaakkaDev/defold-community-challenges: All my Defold community challenge participations
GUI shine effect
by @Pawel
Video: GUI: Animated light effect on logo
Source: GitHub - paweljarosz/defold_gui_shine_effect: A very simple example of a GUI shader for Defold - a shining stripe effect
I will send Steam gift cards to all of you. @selimanac please ping me in a PM to arrange the gift card transfer.