Many years ago I wallpapered an ugly avocado 'fridge that was past it's prime with a plain textured paper. The 'fridge worked fine but was so outdated! I got lots of compliments on the wallpaper and it was cheaper than buying a new 'fridge!
Another solution for metal or enamel-painted metal furniture or appliances is to go to an automobile paint shop for an estimate. They enamel metal all the time, and they have an excellent choice of colors.