Pick a color scheme
Choose the colors that you want to have in your bookcase. Choose 3 or 4. Too much will make the space look busy. After having the colors, stick to your choice through the process.
Use simple decor
Using some simple decorations will make your bookcase pop. Go for whatever you like, just keep the certain color scheme. Choose candles, vases, personal photo frames, or any other personal items.
Do not place too much books if you want to have a stylish bookcase. You should have books and decorations, that should not clutter the case. Leaving empty space will achieve balance. Stack some of the book horizontally to add visual interest.