its just something other forum shop systems offer, you would go to the shop, buy a gift from their you would get a list of gifts i.e. Wine, Rose, gift box, heart, that kind of stuff, you would then enter the username of who to send it to then on the forum it would show the image of that gift under their details.
It just something i know people love to have and use, and know it to be popular on other systems (have seen this on other sites)
R