Painting red waves on wall?

[Joey]

I'm painting the basement a light yellow-green-white-brown, and at the bottom half of the wall, i'm painting red waves. I was wondering how to get neat waves, (stencils, templates) with clean lines. If you want to see more of what I'm talking about, scroll down to look at the links below...

http://www.bhg.com/bhg/story.jsp?storyid=/templatedata/bhg/story/data/1161888283359.xml

Is there anyway to get the smooth, clean lines? Please send LINKS if answers involve products online. I also don't want to just draw the waves and color them in, because it'll probably look too messy.
Also, what are the exact colors of the walls in the pictures of the link i put up? And where can i find furniture like that? Thank you!