Grey/white hairspray?

[Coco-5]

Hi, for a night out my friends and I have decided to dress up as old ladies. Clothes and shoes have come at very cheap prices, but it is the hair we are having a few problems with. I know you can buy 'Granny Wigs' in fancy dress stores and online, but we are trying to stick to a small budget! Does anybody know if you can get grey or white hairspray? The sales assistant suggested using black hairspray with white talcum powder - but does that just look like bad dandruff?? If this is not possible, we are considering leaving our hair in rollers for the night as a backup!
Also, we are looking for a hair tie that may be associated with an old lady, would you think any decorated fabric would work for this rather than buying one?
Thanks in advance for any possible help!

[grasscarp]

http://www.greatfacep...Spray-GreySilver.html