The table is lightweight, fairly study, and useful for putting things on.
And when you don't need it anymore, you can recycle it!
1 box, the right size to be the top of the table. I'm using a flat box that I think was originally part of the packaging for a laptop computer.
4 mailing tubes. The length of the tubes will be the height of the table. (The diameter doesn't matter too much.)
Some sticky-backed plastic, and/or anything else you want to decorate your table with. Plastic is good because it will prevent the table top from disintegrating if you spill a drink on it. You may like to put clear plastic over a collage or a painted picture, in which case you will need materials for that.
You will also need glue, tape, a pen or pencil, and a utility knife.
Turn the box upside down.
Stand one of the mailing tubes on the box. Position it near the corner, and try to make it equal distances away from the two sides of the box. (A ruler may be useful here.)
Trace around the bottom of the tube.
Repeat for the other four legs. You should now have four circles drawn on the bottom of your box.
Make sure your cuts are inside the line. You want the legs to fit tightly into the table top. Don't worry about making the hole too small - the edges of the cardboard will bend when you stick the legs in.
Open the box and remove the cardboard circles you cut out if they fell inside. Set them aside, and close the box.
Push the four tubes into the holes. Turn the table upright.
You can start using your table now if you want, but it will be sturdier once you glue the legs in.