I'm having a t shirt quilt made for my DS15 for Christmas. I went into a local quilt shop and commisioned a women to make a custom quilt out of all his old t shirts. I used school shirts, vacation shirts and photos (she transfers them onto fabric). I picked the color for the quilt, backing and binding. I chose his favorite colors. I know it's something he'll keep forever and it's a great set of memories all in one place. I don't expect him to jump up and down for joy when he gets it on christmas but as the years go by he'll appreciate it more and more. Of course he'll have other gifts under the tree like i tunes cards.
The teen years can be tough and I think the quilt will be a great way to conjure up great memories just from looking at it. I hoping as he lays in bed drifting off to sleep he'll catch a glimpse of a WDW t shirt he once wore and go to sleep with a smile on his face thinking of that great WDW vacation.
If you did this for your grand daughter you could even use pictures of her favorite bands, singers, activities, friends, artwork and of course horses!