I bought a birch 18x24 canvas at Blick and marked the center with a pencil. Then I used painter's tape to create triangles (one at time) so their points all matched up at the center.
I bought yellow, red, teal, cobalt blue and white acrylic paint and mixed to create different colors. The paint dried pretty quickly so I was able to tape off triangles right next to each other by adding a line of tape right on top of the painted edge.
I didn't go into it with much of a plan for a color scheme and I am pretty happy with how it turned out.
I think I might need to seal it with something clear and I am pretty sure I am going to paint the edges of the canvas white.
At the moment, I don't even have a place for it to hang in our current apartment (I moved stuff around for the first photo) but I am so excited to give it prime wall space in our next place. And speaking of our next place - I have a feeling it's going to hold a lot of DIY art. I finished another painted piece on Monday (& will be sharing it tomorrow) and I still have 13 more projects to accomplish by late February...