I just made a TARDIS quilt for my friend's birthday.
The front:
The back:
It's about 2m tall by 1m wide (about 3'x6.5', I think). It has gold stars on the back and a personal message in the sign panel in the door. It took me almost 2 months from the original idea to the finished product.
I've never made a quilt (or anything larger than a small stuffed toy) before, so the going was a little rocky and it's a bit rough in places, but I'm totally happy with the outcome.