@Mir@k: Like I said, I exported it and then imported it as an image, so I can't make it transparent. I did it that way because I couldn't change brightness and contrast, mirror it and rotate it if it wasn't an image (Well, actually I could, but since it's not real 3D, it would've fallen apart
). So, transparency was impossible, but I gained few other functions.
@MDK: Thanks for the tip, I'll try to get GIMP.
Actually, I didn't use other programs because I wanted to do this completely in PowerPoint, to show you that it's possible to do so. I'll use "scribble" to make a shadow, then I'll be able to make it transparent. I'm working on Thor 'mech, but I'm not sure I'll finish it on time. It's legs seem a bit off at the moment...
I made a new shadow and changed one detail on 'mech:
I'll try to finish Thor tomorrow and if I do, I'll make the picture with Thor and MadCat walking side-by-side.