How would i make a Color Choosing GUI Like the one shown here?

If you want a

while true do
(frame name).BackgroundColor3 = (frame name).BackgroundColor3 + Color3.new(1, 1 ,1)
if (frame name).BackgroundColor3 == Color3.new(255,255,255) then
(frame.name).BackgroundColor3 = Color3.new(0,0,0)
end
wait()
end

If this is what you wanted then happy days! :D

Sorry if this isn't what you wanted :C

EDIT:

You can make your own colour table that you want to go on here!

colourtable = {Color.new(255,0,0), Color.new(232,13,6)}
while true do
for i = 1,#colourtable do
colourneeded = colourtable[i]
(frame.name).BackgroundColor3 = colourneeded
end
wait()
end

Sorry if this is worse and not what you wanted!