Incorporating artwork and wall decor in a furnished flat without nails or hooks can be achieved through various creative and damage-free methods. Here are some ideas:

1. Command Strips or Hooks:

Command Strips: These adhesive strips are designed for damage-free hanging. They come in various sizes and strengths, suitable for different weights of artwork.
Command Hooks: Similar to strips, Command Hooks are versatile and can be removed without damaging the wall. They are available in various sizes and styles.

2. Removable Wall Hooks:

Removable Adhesive Hooks: There are various brands offering adhesive hooks designed for easy removal. They can be used for lightweight to moderately heavy items.

3. Washi Tape:

Decorative Washi Tape: Create a gallery wall or display by using decorative washi tape to adhere prints or lightweight artwork to the wall. It adds a playful and customizable touch.

4. Picture Ledges:

Floating Picture Ledges: Install picture ledges on the wall without nails. These ledges allow you to display multiple pieces of art without making holes.

5. Tension Rods:

Tension Rods with Clips: Install tension rods in desired areas and use clips to hang lightweight artwork or prints. This works well for changing displays frequently.

6. 3M Poster Strips:

Poster Strips: Similar to Command Strips, 3M offers poster strips that are ideal for hanging lightweight posters, prints, or paper art.

7. Velcro Strips:

Velcro Adhesive Strips: Use Velcro strips to attach lightweight art to the wall. This is a removable and damage-free option.

8. Easel Stands:

Tabletop Easels: Display smaller pieces of art on tabletop easels instead of hanging them on the wall. This allows for flexibility in rearranging.

9. Over-the-Door Hooks:

Over-the-Door Hooks: Utilize hooks that can be placed over doors to display art. This is an excellent option for doors leading to balconies or closets.

10. Magnetic Display:

Magnetic Boards or Sheets: Attach lightweight metal frames or pieces to a magnetic board or sheet. This allows for easy rearrangement and is ideal for smaller items.

11. Display Ladder:

Leaning Ladder Shelf: Lean a ladder shelf against the wall to create a display space for artwork. This doesn’t require any wall attachment.

12. Decorative Tapes:

Decorative Masking Tape: Use colorful or patterned masking tape to create a tapestry of prints or photos on the wall. It’s easy to apply and remove.

13. Adhesive Wall Decals:

Removable Wall Decals: Choose removable wall decals that mimic the look of painted art. They add visual interest without damaging the wall.

14. Display on Furniture:

Furniture Display: Arrange art on furniture surfaces like dressers, shelves, or side tables. Lean larger pieces against the wall for a laid-back look.

15. Display Easel Stand:

Decorative Easel Stand: Place art on a decorative easel stand. This is a stylish way to showcase paintings or prints without hanging them.

16. Temporary Gallery Wall:

Temporary Gallery Wall: Arrange lightweight frames on a large piece of removable wallpaper or fabric. This creates a temporary gallery wall that can be easily moved.

17. Hanging Planters or Shelves:

Plant Hangers or Shelves: Use plant hangers or floating shelves to display lightweight art. This adds a touch of greenery while showcasing your artwork.

18. Prop on Furniture:

Prop Against Furniture: Lean larger pieces against furniture like a sofa or sideboard for a casual and changeable display.

19. String and Clips:

String and Clips: String a thin wire or twine across the wall and use clips to attach artwork. This provides a flexible and customizable hanging solution.

20. Corkboards or Pinboards:

Corkboards or Pinboards: Use corkboards or pinboards to pin up prints, photos, or lightweight artwork. It’s a dynamic and easy-to-change solution.

Always check the weight-bearing capacity of the chosen method to ensure it can support the artwork you intend to display. Additionally, follow the manufacturer’s instructions for application and removal to minimize any potential damage.