I hate the textured walls in the kitchen & Trevor's room. Someday maybe i'll get around to doing this... How to skim coat walls (smoothing walls with a lot of damage or a textured paint job). Using prime first and a roller.
Homemade Polymer Clay - My favorite is a polymer clay also known as cold porcelain. Its main ingredients are cornstarch and white PVA or Elmer's glue. I like it because it's smooth and a little bit elastic to work with and dries extremely hard. It's also relatively non-porous so it takes paint really well. And it doesn't degrade over time like baker's clay or salt clay does