Are there any things you like that are temporary and experiential? For instance, I really like things like coffee, wine, movies, weekend ski trips, nice restaurants, etc. All of these things can be given as gifts, and better yet some of them can be enjoyed with the gift-giver (and spending quality time together is the best gift, really), but don't take up any space. I've had some success over time making it known that I really prefer these sorts of gifts.
Or just nice pairs of wool socks – I wear out about 5 pairs a year, which is about the right number to receive as gifts. But people might not believe you that you love getting socks :)
So my in-laws violate my "I don't want anything" desire.
EVERY Christmas they but me a new pajama set (or two). Thing is I sleep in my boxers so I have a drawer full of rarely/barely worn pajamas. (I just realized... I'm going to be donating them now and from now on unused to the Salvation Army).
Don't get me wrong, I think socks are a great gift... they wear out and fresh soft fuzzy socks rock!
My mother in-law sends me socks once or twice a year and it's the best gift as otherwise I'll wear socks until they aren't even one piece anymore. Socks and good beer are the only gifts I normally enjoy receiving.
Anything else I'll buy for myself. I'm perfectly happy to not receive gifts.
Giving and receiving the consumable gifts is the best I think, and I'd rather give/receive cash than gift cards as the extreme version of that. I generally wouldn't consider clothing a consumable item though -- I wear socks until they have holes in them, so it surprises me that you wear out 5 pairs a year. I was successful in a "no clothes" policy for several years, but apparently I need to renew it since over the last few for my birthday and Christmas I've gotten several wool socks from more than one party that I really don't like... They don't fit my feet well (they're "appropriately sized", but don't fit well for the same reasons Nike shoes of my size don't fit well), I wear them as a last resort if I somehow run out of my clean regular white cottons that last forever. The wool ones are the first to go in the donation heap...
I suspect we live in different places. I live in Colorado, where it makes sense to wear wool socks a lot of the time, and I wear them out from walking and hiking a lot. Obviously it's a personal thing and I mostly included it as a joke :)
Or just nice pairs of wool socks – I wear out about 5 pairs a year, which is about the right number to receive as gifts. But people might not believe you that you love getting socks :)