Impossible to say without a photo but I would suggest that you don't want to make a feature of them. Unless your wall colour is already Monument then stay away from Monument as it will draw attention to them. I would try and make them as close as possible to your wall colour, and the same colour for top, side and bottom. They will be a more dominant feature than your gutter colour so it doesn't make any sense to match your roller shutters with a gutter colour.

Best of luck,

Dr Retro

of Dr Retro House Calls

Sorry I thought I had attached photo

Monument will look quite strong on a such a large area. I would have also said matching your wall colour until I looked at your pic. You have a lovely cream colour air vent at the middle bottom of the wall. I would go with that. I think colour bond color is Surfmist.

Thanks for your feedback. Could I get away with bordering with the monument colour?

Either do the whole shutter monument. All the whole shutter same colour as the air vent. It will date very quickly if you mix the two colours.