Step 1: Materials!
Ikea "Habol" set of two boxes - $5.99
Adhesive. I used Gorilla Glue but something like caulk or a super glue would work. You will want something that works with glass or plastic, depending on what you use as the top of the table.
A panel of any type of hard material at least 27" by 35"
Mine were found in a clearance pile at Ikea. You could probably get something in the "As Is" section. In a pinch, wood or cardboard could do.
Large items to use as weights such as books
Spray paint or laquer
Round felt floor protectors for furniture legs
Step 2: Adhesive
You will then need to attach these pieces together and use some type of weight, such as large books, to help the items bond.