Summarize:

Textured wallpaper comes in either rolls or uniform tiles that you hinge, connect, or stick onto your wall. Search for "textured wallpaper" to generate a list of retail textured wallpaper providers. Textured wallpaper comes in several different forms, each of which may have different directions. To apply rolls of textured wallpaper, probably the most common kind, simply measure the wall, measure your wallpaper to fit, cut out pieces of wallpaper, and apply them to the wall with a strong adhesive.
Purchase textured wallpaper. Apply the textured wallpaper to your wall.