Please don't be scared away by the charts and so on for making these quilts -- it's not an exact science! I have made some really quick-made weighted items for a local group that serves traumatized children, and many of them are comforted by the weight. Our Project Linus chapter has given them weighted pouches, weighted "shawls" (so to speak), as well as a blanket made with the folded sheets method and one made with plastic pellets. They have all been very effective.
I considered the folded sheet method, but I thought 1. it was expensive to make, and 2. it would require a lot of washing and refolding of the sheets whenever it was washed. I also didn't want to invest in the plastic (washable) pellets, but if I were making one for a loved one, that's the route I'd go.
Feel free to PM me if you have any questions...