Can you recommend a fun DIY project that can be accomplished in a weekend?
Sure, however the DIY projects that I should recommend depends on the tools you have available (eg. woodworking tools) and the workspace you can use (you live in an apartment, or you live in a house with a backyard). What tools do you have?
I have some glue, cardboard and scissors.
Sure 😃, here's a fun and creative DIY project that you can make with glue, cardboard, and scissors that is also useful:

Materials:
- Cardboard
- Scissors
- Glue
- Decorative paper or fabric
- Ruler or straight edge
- Pen or pencil

Instructions:
1. Begin by measuring and cutting out a piece of cardboard that is 8 inches by 10 inches. This will be the base of your DIY desk organizer.

2. Use your ruler or straight edge to measure and mark three lines on the cardboard: one line 2 inches from the left edge, another line 4 inches from the left edge, and a final line 6 inches from the left edge.

3. Use scissors to carefully cut along these lines, stopping just short of the right edge of the cardboard so that you create three flaps.

4. Fold the flaps upward and inward to create three compartments for your desk organizer.

5. Use glue to attach decorative paper or fabric to the outside of your desk organizer to give it a more finished look.

6. Once the glue has dried, you can use your desk organizer to store pens, pencils, paper clips, and other small items on your desk.

This DIY project is a fun and useful way to organize your workspace while also getting creative with cardboard, scissors, and glue. You can also customize the design and size of the organizer to fit your specific needs. Have fun creating!