Saul,
There is stuff you can "stir" into paint to make it textured, but I've never seen Textured paint.
usually, its drywall mud that is applied with an air compressor and a hopper through a texture gun. Most interior walls are what is called an "orange peel".
This list of Top 10 mistakes by Do It yourselfers was on Msn today...
http://realestate.msn.com/Improve/Ar...umentid=454916
I direct you to #'s 5 and 6
5. Using the wrong paint. One of the biggest DIY projects around, painting can make a place look great. Manfredini says flat paint should only be used for ceilings. Interior paints should have at least an eggshell or satin finish so you can scrub it. On outdoor decks, "sun and rain tear the heck out of the wood," he says. Clear sealers don't block the UV rays, and they peel. Use a linseed-oil-based stain; it drives the pigment into the wood and preserves it.
6. Improper preparation of walls for painting. A good, quality paint job is 90% preparation, Manfredini says. Clean the walls, sand them and patch any holes before you paint. Iannuzzi recommends a coat of primer or stain blocker if you're trying to cover over oil-based paint, stains or peeling paint, or if you're painting a lighter color over a darker color.