different designs in each block are fine if that's what you want to do- as long as it is (balanced) you don't want to heavily quilt some areas & leave some with much less quilting-
as for transfering- there are many products on the market- just search transfering designs.
there is a new product on the market- you can run through the printer then just peel it off it's backing and stick it on your block- stitch through it & it washes away when your are all done. you can use stencils, the press & seal plastic wrap- you draw on it- stick it to the block-stitch- then tear it away---or you can use any number of transfer pencils/markers available.
be sure & show us pictures! we always love to see them!!!