In the summer holidays i painted my bumpers. They were grey but now white. Be careful with metalic colours because it would be harder to match, because my car was white it was easy. It took me about a week to do it though, both the bumpers and i didnt drive my car in that time. I used cans and it turned out better than i expected. I taped the areas around the bumpers, and sanded them alot. Make sure u sand heaps to get them smooth. Also on the back bumper there is ledge which is hard to paint. All up it cost me around $80, not bad but be careful when pulling off tape not to peel paint. Make sure u use lots of plastic primer and get it in the gaps.
Ive had some peeling issues but that was from my lazyness. It made my car look ten times better though.