Older F-150's had chromed or stainless or something and they had 15" rims. Go to a junkyard, get a set in reasonable condition.
Then steel wool the living crap out of them, clean them with solvent and handle them with clean gloves. Spray them with a few light coats of primer from a rattle can, building it up slowly to cover.
If you use a "sandable" primer you can use some extra-fine sandpaper to smooth them out. Then use what's called a "tack cloth" to clean off the dust.
Then hit them with a spray close to your body color. Should be easy and cheap and you can probably get a set of the rings from the JY for $20 or less. Maybe another $20 to $30 for paint and stuff. Should be a cheap mod.