I have repeated this block by GN and now I want to add random colors to each block, but when applying random colors it makes each block have multiple colors, while I want each block to be the same color, and I do not know why this happens. anyone can help, please.
Hi Aya_Elhawary,
are the blocks/buildings separate objects?
Welcome 
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It’s not really recognizable where you added the color… you may just add it “later” in the GN setup ?? (or show more of it …)
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To add to what @rigoletto said you could also use a White Noise texture to drive the Color Ramp like so:
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this is the original building, then I duplicated it vertically and horizontally by GN and I tried to make a city so I duplicated the building and tried to randomize the color by GN but it made each floor with a different color. is there any way to make the whole building with the same color
OK, but the buildings themself are separate objects, right? Like so:
If yes, either use one of the solutions provided above or use the Object Color to define a specific color for each object/building like so:
If no, then (as @Okidoki already pointed out) you would have to show us more of the node tree or send us the file, in order to help you
No no, i meant the Geometry Nodes tree
Yeah I know, that is the Geometry Nodes tree. I made a brick material and then I tried to add random colors to it
That is definetly the Material nodes tree - not Geometry Nodes.
If you can, share the file with us.
Alright, i think i have it:
Before instancing the buildings, store a random value per instance in the Geometry Nodes setup. You can then access this value in the Shader Editor with an Attribute node (type Instancer) and replace the Object Info - Random node with that.
You also have to change the seed per Object so the colors don’t repeat themself.
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Oh… very quick thought…
You are coloring the building in the genereal GN network… ( you should also name this… for example “building generator” or something… 
) so if you want to color every “building” in a random color then you should to this by coloring the plane which this building are built on… and use this color in the GN…
maybe by a second GN (but as first modifier) producing somecolor and use some attribute “transfer”…
…damn @Zebrahead was faster 
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Thx guys! It worked.
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