there are many scrap quilt books on the market and there is even a scrap quilt magazine- you can of course just make scrappy blocks when ever you see a new one you want to make- or have an idea for- or just feel like making a few scrappy blocks---then when you have enough blocks to make a quilt lay them out & decide on a layout you like- sometimes you need to decide on a color to bring it all together- adding sashings or something to make it all work- sometimes just putting the blocks together works great....browse the galleries of scrap blocks/quilts & make ones as you have scraps and like one---the great thing about scrappy quilts is you don't have to have a plan...and you never have to worry about running out of a particular fabric- when you run out of one you simply start using a different one.