Hey Marci,
Official licensed hairdresser here... off the scalp color (ie: Highlights by foil/cap/saran) is a good choice. There are also non-peroxide temp colors you can use (Roux is wash out and only application by application) if you want some kind of overall coverage.
In my case, my bloke wants to see my natural color (now, keep in mind this.... he is over 80% colorblind! Like he could tell?
)... so, I'm letting the *ugh!* gray hairs pop in... (trust me, at this rate, it won't be for long)....Another thought... hair grows on average (again, "individual results may vary...") 1/2 inch per month... so, you can either hang tough... or try the off-the-scalp highlights (post-surgery, I'd stay clear of cap and go for the foils).... try Roux (picked up at beauty supply and some drugstore chains in the hair color aisle, usually bottom shelves)....
*takes off cosmetologist cap*
Ok, I'm done! Hang in there!
Phyl