IKEA Lack shelves are ones with the wall thanks to the concealed mounting hardware, and they perfectly serve for storage. There are lots of ideas to use them and to hack them, let’s consider some of them to get inspired.
Kitchens
Lack shelves in white and black can be cut according to the size of your space and you can display dinnerware or drinkware on them. Add glass holders underneath the shelf, or attach a rail to hang mugs on hooks, it will save some space. Organize your own home bar using black Lack shelves: place your drinks and glasses on the shelves, add lights underneath and place lemons and other necessary stuff below.

These shelves are perfect to organize your grains and kitchen supplies. They also look great on plain subway tiles. (Murchison-Hume).

A Lack with glass storage underneath is perfect for a home bar.

Thanks to its size, these floating shelves could occupy awkward corners. (The Cavender Diary).
Bedrooms
Various IKEA Lack shelves can be widely used in bedrooms: attach long Lack shelves along the whole wall for storage, do it lower than usual to achieve a cool effect. Place a corner Lack shelf in the bedroom, put some bedside lamps on it. You can also cut a Lack shelf to a smaller size and attach it by the bed, it will be a great bedside table for your bedroom and will save some space.

For small space living, LACK shelves are perfect. In glossy white they look great on dark and moody walls. (Urban Aesthetics).
Living Rooms
Lack shelves are classics in the living rooms, hack them as you need, cut them and attach to the walls. Display and store your books and other items, use them as photo stands and so on – these shelves are cool! Open shelving is the best way to store and display at the same time, it saves space and looks airy and light. Have cats? Take some Lack shelves and attach them as stairs or shelves to let them jump from one to another and have fun.

A dark Lack shelf hung just high enough above the dark hardwood floor to allow for record storage underneath.

With light modifications, several LACK shelves could become a single beautiful storage solution. (stephane chamard).

Display the stuff you bring from travels. Floating shelves provides lots of space to do that without looking too bulky. (Heather Merenda).
Home Offices
If you have a home office nook or a whole room, Lack shelves will be a perfect option to try. If you attach them well enough, you can use them not only for storage but also as a desk. Black and white, corner and usual, these shelves will bring comfort for little money.

Hang LACK shelves above your deck to display your favorite decor. (Sarah Seung-McFarland).

Hang the shelves close to your ceiling and put some boxes on them. They would look good and hold lots of your craft supplies at the same time. (Kristen Wall, a Smith & Noble In-Home Designer).
Kids’ Rooms
Lack shelves are ideal for kids’ storage: they can be bookshelves or display shelves, they can be used for shoe storage and you can add a rail to hang clothes underneath the shelves. Attach the shelves in the playroom to use them for toys.

A Lack shelf with a rod underneath makes a perfect place to hang baby clothes in a nursery.

Oak Lack shelves looks great on white walls in this study corner of a teenager. (Sapphire Living Interiors).

In a nursery you can display some cute animals on these practical shelves. (Emily Tait Designs).
Bathrooms
Floating shelves are perfect to organize towels, toilet paper or even display some decor in bathrooms and powder rooms. Although you can even create a plant wall with them.

Lack shelves looks great over a toilet. Besides you can put as decor as towels and toilet paper on them.
Makeup Storage
Lack shelves can be turned into whole beauty stations! Corner shelves on the sides of your mirror can serve for storage; attach two long Lack shelves and place some cubbies between them.

Lack makeup station with a makeup desk and a lit mirror.
Shoe Storage
Attach Lack shelves in closets or entryways, or even in the bedroom to store and display your shoes. A glam room will look cooler with your stunning heels displayed.