This is one of those purely frivolous vanity purchases. Nobody needs black tissues, but isn't it nice to know they exist? At $3.50 for 50 tissues they won't break the bank, but compared to $2.50 or so for 200 "normal" tissues, these are probably best saved for parties, not the flu.
Looking for that perfect gift for the person who hates everything? How about something to scare the bejeezus out of your mother-in-law? Just want a treat for yourself? Then check out FEARnet's Gift Guide, packed with hundreds of hand-picked items, updated weekly with stuff you need, and stuff you didn't know you needed.