Here are the supplies you'll need:
a stretched canvas
big paint brush
white acrylic paint
tissue paper in primary colors
Stretched canvases can be purchased in any arts & craft store. If you buy a cheap one, and why the hell not, they're not as expensive as you think. You can often find the store brand canvases are bundles in packages of 3 for a cheaper price. Since you're buying a cheap canvas, you'll want to paint the whole thing with a nice coat of white paint first. Even if the canvas looks nice and white, it will look even better with a coat of paint on it!
Ah, that's better. Set that aside to dry and now here comes the only hard part in the whole project. Cut out 3 circles from your tissue paper. Get creative and play around with different sizes. Here comes the 'cheap' thing again, buy the cheapest, crappiest tissue paper you can find. You don't want that thick, expensive stuff because it won't be translucent enough. I got mine from the dollar store where they had a huge selection of colors for $1 each. Try to get bright colors that will pop against the white background, the 'red' in this trio is really a bright magenta.
Before you make anything permament, play around with the positioning on your canvas. The secondary colors that the paper make when you lay them on top of each other will look different depending on who's on top. Also, I think it looks cool when some of the bubbles goes off the edge.
When you figure out your arrangement, spread a thin coat of Mod Podge where you want the first circle to lay. Carefully and slowly lay the circle down while smoothing the air bubbles and wrinkles with your brush. It's easier to start from one edge and work your way across.
Once the circle is smoothed out and most of the wrinkles are gone, put another coat of Mod Podge on top. BE CAREFUL with this step because the paper is wet and will easily tear at this point. And if the paper tears, your face will look like this.
Repeat the same steps for the other 2 circles.
If you're amazing and more patient than me, you'll take your time to smooth it out perfectly. I kid myself into thinking it looks better with wrinkles.
After all the circles are in place, add another coat of Mod Podge to make it look uniform.