Mix & match some harmony & some contrast – some upright, some horizontal. Keep some shelf spaces exclusively as center pieces for displaying special loved & meaningful items. Signature items that speak about you & your history. Perhaps a pen, a journal, a picture, or pictures, or your favorite collectibles. The things you love & enjoy to have around you.
Learn what home improvements you can deduct on your taxes. http://filemytaxesonline.org/tax-deductible-home-improvements/
Shop around – don’t buy all your items from one brand name, manufacturer or store. Hand pick your color paints, fabrics, wallpapers, borders & other trimmings to suit your overall vision & picture of what you want to achieve.
If it says something about you & holds its own as an item of interest & character – feature it as a center piece, give it pride of place, & then build around it. Arranging Your Furniture. Arranging your furniture in a room to make the room do what you want is key to maximizing the livability & ambience of your room.