In Scratch you can sense when a sprite touches a colour. It is simple and then the sprite does something.

Drag over your green flag, change backdrop and all that,

Drag over the ‘forever’ loop,

Bring the ‘if <>’ loop into the ‘forever’ loop,

Go into the Sensing section and drag the ‘touching colour <>’ into the ‘if <>’ block,

Click the coloured square in the ‘touching colour <>’ block,

Click any colour on the Scratch interface to change the colour,

Add whatever you want the sprite to do into the loop,

Click the green flag! 



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