ALL the time! LOL
Sometimes though I flip flop between which block the fabrics would look better in ... but I really prefer patterns that I can do from strata, so am often looking for new ways to use strips.
I do like Electric Quilt's ability to scan in fabrics (or using images from the manufacturer) and put the actual fabric in the design I'm working on.
And also why I always do test blocks before I do a whole bunch of cutting, to be sure I like the way it's going together.