The extension uses the normal app Inventor integer color, but you could convert a hex color into an Integer color , using Color Utilities component 
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i just have a uestion and it is
can i add pixer fooonnntttt??
please add custom texture image from sd card ,
Textureimage block not working when I add and image directly from sd card 
Dear, can you add a block for desregister? Mean after i add guardian effect, and after some i want to remove it, then i need to do desregister. Did you can? Thanks in advanced.