I haven't had much, but I did make this bag for my niece this weekend. She surprised me no end by saying she like Cath Kidson stuff. She is a teenage girl who is usually on the grungy end of fashion so I was really taken aback by it.
I found a fat quarter set in John Lewis so just went for it. It turned out around 12 x 16 inches which I think is a good size. I cut old jeans into 2.5 inch squares to make the main body and then straight stiched to help reinforce the seams as denim frays very easily.
I put some velcro in the outer pockets and made some inner pockets for the first time. It all turned out better than I expected. It probably isn't big or robust enough for school as they had to carry so much around all the time, but should be good enough for taking her ipad around. Assuming she like it, by Christmas she may have gone of the Cath Kidson anyway!
Sorry for the rubbish pics, but its been so dark today nothing I could do improved them...