I have never worked with washi tape before. For my first project, and guaranteed success, I chose to do a light switch cover for my daughters room to start. I took a plain plastic cover and started in the middle of the light switch and wrapped the edge under the backside. I then matched up the pattern with the next strip of tape until the light switch cover was complete. The tape was strong and easily positioned when I laid it down crooked. I tried ripping the tape from the top edge where I cut and it ripped easily, but when I snipped a section, where the switch goes in, and pushed on it which did not rip easily. This resulted in the tape slightly bunching but it was easily fixed. This was before I fixed the bunching. But how adorable is this? I was able to smooth out the bumps and kept the extra on around the corners so it held down after I screwed it onto the light switch. We are in the process of moving so I didn't install but will update with a picture of it installed in the new place. :)
Decoration: Mirrors, cupcake stands, closet doors with insets, Corkboard borders, picture frames or a faux matting, jaxx up plain vases, cover cardboard letters for a child's room, paint a canvas in contrasting color and then do a chevron or abstract pattern on top, abstract wall art, baseboard or wall border, wrap around clear or frosted candle holders, wrap around rim of indoor potted plants, jazz up acrylic serving trays, or Christmas ornaments.
Kids: Washi tape race track on the floor, put a few strips of the tape across a plain colored not card for pizzazz, Headbands, wrap pencils to make them fancy, cover metal band aid containers for holding Band-Aids, mints, or little treasures, jewelry, transform jars into simple vases, coasters, wrap cheap plastic bangles with tape for fancy jewelry, step stools, or a door frame.