To make your kitchen look taller, you need to make your cabinets rise up to the ceiling, it’s a nice way to add height to the room. Still, if it happened so that you have basic and not up to the ceiling ones, it’s ok and you can use that dead space to advantage, too. How? Here are some ways to do that.
Add Shelves To Cabinets
There are many tutorials on how to add height to the cabinets, some of them tell how to seamlessly add height to them, others tell about building in additional shelves on top. These shelves can differ in color or not, and they can be used for storage and display. If you are ready to DIY, you can do that. If not, then

These shelves are built over the cabinets to used them for storage and decor. (via penniesforafortune).

This two-colored kitchen features additional shelves built-in and some baskets on display.
Add Storage To The Cabinets
Place storage units to use this space as much as possible. These can be usual and wire baskets, boxes, buckets and other stuff, choose those that match the style of the kitchen. These containers will help you organize all the stuff you put there highlighting the style of the space. If you don’t want that, just place the things you don’t often use there and voila.

The cabinets are done with a row of baskets that can be used for adding texture and for storage, too. (via apartmenttherapy).

Stack the spice jars on top the cabinets if you don't have space for them in cabinets or on the counters.
Add Decor To The Cabinets
Giving a character to the kitchen is quite problematic as it’s always not enough space for any decor. Use the top of the cabinets to decorate the kitchen and display art, photos, figurines, various books, vintage tableware and much more. This idea can be paired with the previous one and you can have both storage and decor space without wasting shelf or wall space. If you style your kitchen for different seasons and holidays, seasonal decor can be also placed on cabinets.

Bright red posters stand out a lot on top the slate blue cabinets. (via domino).

Greenery, boards, dishes, a wreath all match the rustic style of the kitchen adding freshness to it. (via honeynhydrangea).

The cabinets are decorated with books, boxes, vases and plants to give interest to the neutral space. (via christeneholderhome).

Art paired with potted greenery elevate the look of the kitchen to a new level. (via ladydecluttered).

Topiaries and tableware are a lovely decor combo for a cottage or farmhouse kitchen.

These additional shelves built over the cabinets are used to display beautiful vintage tableware, it's a buffet alternative.

Your cupcake and cake stands can be placed on the cabinets not to waste your cabinet and shelf space.

The modern farmhouse kitchen is perfectly accented with a wooden hood and a matching wooden sign plus greenery and pumpkins.

Place your old but loved porcelain or just tableware on top the cabinets to see it from time to time.

Candles, spice jars, art and plants - these are just some objects you can display on the dark cabinets.

The space over the cabinet is taken by potted plants, a cage and giant cutlery for a cute and fun look.

This cottage kitchen features a basket and some kitchen stuff used for decor and to add a cozy feel to the space.

Seasonal decor, for example, Christmas decor, is always a good idea, and placing it on top the cabinets will save a lot of countertop space.

Make additional shelves on top the cabinets, they can be of a different color to make a better backdrop for your objects.

Baskets and a sign are a cool combo for styling a kitchen, they will add a rustic feel to the space.

Make a gallery wall on top the cabinets, the only problem with this idea is that they can get greasy after some time.
Bring Life To The Cabinets
The last but not least idea is turning your cabinets into an orangery, no matter if these are real or faux plants, greenery is always a good idea. If you choose real ones, make sure they will grow in these conditions or just opt for herbs that you will eat soon. Get inspired!

The cabinet top is done with potted plants and blooms, this is a whole orangery in the kitchen that takes no additional space.

The top of the cabinets and shelves are taken by potted herbs, which turn the kitchen into a biophilic space.