World is full of stuff and dispensable products. Elämyslahjat.fi in Finland is a service provider selling gift cards to experiences. Its a perfect and nature friendly way of remembering your friends during birthdays, events and more. Check out the link above. (it is Finnish, as so is the service provider and location for this climbing gift card.)
However, this is a great example which will also work around the world. Give yourself a treat and experience. Enjoing the time together is many occasions better than dispensable stuff.
Kaarle Vanamo, the creator of ClimbStation