Wouldn't look tacky. I use a Nice n Easy dye (natural auburn/ light auburn I think?) which gives quite a natural looking red tone (red dyes do fade quite quickly though) and most people assume it's my natural colour (I too am a fairly conservative dresser!) They do the same colour in the regular dye and the foam range so you can pick whichever you prefer.
Love red! I went from blonde to red a while ago -but be warned its a bitch to get rid of!
Nice and easy are always good to do at home and they have some nice red shades that aren't to bold, if you want to go abit braver then try the this one its not too bright but bright enough for a statement.
So thinking of going for a more reddy tone? would that look tacky?
Im naturally a mousey colour hair, usually dyed to a mid/dark brown, used to be full head of blonde highlights every month but budget dictates that that is no longer feasible.
Very cautious of going lighter at home, which is why i have stuck to the mid/dark browns, but i am bored of them. I want something to give a bit of a lift. Im 36 and a fairly conservative dresser so wouldnt want to go overtly red. Fair/pale skinned and green eyes.