browse books of quilts, magazines, on line galleries and pay attention to the quilting on all the different quilts you browse- with time you will see how different quilts are quilted & start getting your own ideas on how yours should be- often appliqued quilts are (echo) quilted around the appliques then some background quilting is done- stippling, or cross-hatch- a meandering all over-
you can enhance/embellish the actual appliques- like stitching shingles on a roof, lines of doors/windows- (like embroidering to enhance a design) there are so many options and it really is a personal choice- look through galleries that feature the type of quilts you are making & see how they are quilted- you will be inspired & figure out what you like & don't like