wonder,
Anything you can do with dumbells you can do with powerblocks. There are to many exercises to list but to name a few for the legs; dumbell squats, lunges, stiff leg deadlifts.
Also find a retailer for powerblocks in your area. Try and make a deal. Tell them you find them on the internet for a good price and see if they will match it. You should be able to get them for less than retail price.