STYLING A BOOKCASE

WONDERING HOW IN THE HECK TO MAKE YOUR BOOKCASES LOOK ORDERLY AND UNCLUTTERED? ITS AN AREA THAT CAN HOLD LOTS OF STUFF....BUT DO WE NEED TO TOTALLY FILL IT??? SO HOW DO YOU STYLE A BOOKCASE?PERSONALLY, I LIKE TO DISPLAY PHOTOS, BOOKS, AND DECORATIVE OBJECTS.......BUT I DON'T LIKE IT LOOKING CROWDED....SO, I LIKE TO GROUP " LIKE" THINGS TOGETHER...I COLOR COORDINATED MY STACKS OF BOOKS SO EACH