If you want to build you own cheap DIY Laptop stand, then you should go to Lifehacker because their reader, Aaron Kravitz has the example of $8 cool DIY metal laptop stand and a few strips of leather as the grip.
This laptop stand was made with only a few bars of metal, metal screws, a hacksaw and leather strip with the total price sum up to be around $8. Looks cool indeed, simple enough for anyone to DIY if they have the materials. Perhaps you would say that the laptop stand lack in stability, you can actually make the bars holding the laptop longer or just make two of them, holding your laptop side by side. That should do it.