This isn't as crafty as most of you get, but it's something besides knitting and quilting for me, which is what I usually do.
My brother got a new laptop, and didn't want his old bag anymore since his new one is bigger and doesn't fit in the bag! I happen to have the same size laptop as his new one, but am too cheap to go get my own good laptop bag. He gave me his bag, so I added a little section to make it bigger. It involved ripping out seams on nylon (ick!), hemming those seams and inserting a panel. I couldn't do it all by machine, 'cause the throat on my machine is not big enough (whine), so I got some practice handstitching pretty like.
( just after pictures )