Awesome book, I bought it to help develop a character idea I already had, and I can already see all different kinds of PCs these backgrounds can help inspire. Some are more general (like miner and farmer), and some are more specialized (planar scholar, anyone?), but they can all help you flesh out any new character concepts you have, whether it's to come up with new ideas from scratch or refine existing ones. Also, as backgrounds don't directly impact gameplay that much, it's easy to imagine basically all DMs accepting this as homebrew, especially the way they're written; they're very similar to the ones in the PHB.
[5 of 5 Stars!]