Idk, I'd like to kinda, but wouldn't the contacts be extremely expensive? Might go with the face paint though.
Red contacts or even glow in the dark red contacts are pretty cheap really (Here in Australia its about $60AU for a set that will last several weeks, cheaper I imagine in the US). But as for the kind that cover your entire eyeball I'm not sure, I imagine they're pricier and probably require an optometrist’s appointment. But it would look REALLY cool though to whip of your bucket to reveal staring red eyes of doom.
Hmm... What do you mean that last a couple of weeks? Does that mean they would wear out or something? Is that normal for contacts?
Yeah. Contacts wear out in much the same way a toothbrush does, left alone they'll be fine for ages, it’s the amount of times you wear them that counts.
The corrective kind I wear (and the most common type for coloured lenses) theoretically last for 30 days (or 30 wears), ie putting them on in the morning and taking them out at night. But of course you can wear them for WAY longer than this, that's only the manufacturer's suggestion and they're interested in you buying more sets more often.
You don't need to keep track of exactly how often you've worn them either, you'll know when they've had it - they'll become uncomfortable to wear. With proper care they can last for quite a while.
Be warned though, for the first few days you'll have a hell of a time putting them in and taking them out, once they're in though you shouldn't be a problem. I strongly suggest visiting an optometrist so they can show you how to put them in etc... makes it a lot easier.
They look REALLY cool btw, my friend has some Zombie ones; they're all white so his entire eye is white except for his pupil.
Hope that helps.