Curbly guest Craig spied an old post of mine, Attention Woodworkers: Make this Pisa Bookshelf and got all evil genius about it. Craig made a schematic of workable plans for the bookshelf using Photoshop. Here's how he explains how he made the plans:
I take a photo of a shelf which is always at an angle, and use Photoshop to rotate it so it's straight, then make a new layer and trace it, then resize it to actual, and in PaintShop I can throw a 1 inch grid over it and do a screen capture... Well it sounds more complicated than it really is :)
As far as that last sentence, I'll just take Craig's word for it. In the meantime, here's a snapshot of the outcome, which you can also see here.
Of course we here at Curbly don't advocate co-opting another artist's work and passing it off as your own. But a one off for personal use with attribution to the original...why the heck not?!