Our daughter and son-in-law painted three walls the SW Basket Beige, the wall that had the stripes was painted a nice SW pink Rosy Outlook, I think. We used blue painter's tape and a laser level after coming up with a pattern that was visually appealing, using the 4 other colors. We measured and taped off the vertical spaces, allowing the the pink to be one of the colors in the pattern. Then painted the remaining 4 colors with a 3" sponge roller.
Our secret was to really press down on the edges of the tape so none of the paint could bleed through. We were painting on plaster walls in a vintage building and the stripes were surprisingly straight, very little touch-up was needed.
I wish I still had close-ups on my computer, but they were all saved to shutterfly. Good luck!
there is a new tape called Frog Tape that is carried at Lowe's (maybe HD but IDK). It actually has a silicone glue base to seal out the paint from going under the tape. All you have to do is smooth it out. A wallpaper smoother (approx. $1.74) will do the trick too. I took the Frog tape, a laser level and the blue chalk that you can flick to do mine and they turned out perfect!
Fantastic!! Thank you for the tips! I can't wait to see how it turns out!