Here's the picture, then I'll explain how I did it. :)
So, you take your base coloured/patterned papers (and I think next time I will use a less busy base pattern at the top). Modge podge the back of it and apply it to the canvas, keeping in mind that you want to go over the edges (so that if you're using a used canvas, you don't have the ugly art showing at the sides). I started with the solid colour at the bottom and the I added the patterned background (overlapping the solid bottom slightly). Next, you cut out your templates (I found the giraffe and elephant on Martha Stewart's site - she's got some pretty awesome creative resources there for free!). I first cut out the giraffe shape, traced it on the back of the scrapbook paper I wanted to use, cut it out of the scrapbook paper, modge podged the back and stuck it on the canvas where I wanted it. Then, using the same template, I cut out the giraffe's spots on another coordinating colour and modge podged them on, one at a time. Next I did the elephant, similar method. Once you have everything modge podged onto the canvas and it's relatively dry, you need to go over the entire picture with modge podge, spreading it evenly. This will ensure that is stays stuck. :) Do this 2 or 3 times, letting it dry between each application. Once the last application is dry, spray it (outside or in a well ventilated area) with clear acrylic sealant spray. This will preserve your creativity much better and give it more of a glossy finish. It will also protect it a bit more from moisture.
Once all that is done, you're art is finished! :) Be sure you choose your colours and patterns wisely. You can see that my background is a bit too busy and, as I said, I'd have chosen a different pattern if I'd do this one over. So, the next time I do this, I will choose more wisely. :)