Gloss paint leftovers (Brinnington SK6)

I want to gloss paint a shed door and a gate, about 8 square metres. Any strong, bold colour, definitely not white is welcome. I suspect there are people out there with dregs they can't find a use for, condemned to waste, while I am not keen on buying a whole tin: it's probably economical to travel to you. It's the sort of thing you could leave on your doorstep. Regards.