The gift exchange is a very good idea, it's always a good experience to get an unknown gift, it gives you way more emotions than a regular gift. Also is a pleasure when you put some effort in order to make someone happy. The last time when organized such an event with our friends, I decided to give them a photo blanket with all our adventures and nice moment that we've spent together. Now we're gonna take them with us whenever we will camp again, because they are also very warm and cozy.