I came across these pics (on Pinterestof course lol) and I thought they would be pretty cool to try. But I wouldn't even know where to begin. 

The first one definitely looks a little more complicated to get the image around the corners, but the second you simply wrap it around your cake. I've purchased the icing sheets but have yet to use them. Good luck and let us see if you use any! =)

Would there be any way to do either without a printer?

.........any way to do either without a printer?.......

Not unless you are an excellent artist and hand paint each part.

Just as an aside an issue that has been raised often:  Those pix are of copyrighted images and you cannot legally sell such a cake.

yeah... I can barley draw and evenly proportioned stick figure half the time 

and if I did anything like that it would purely just for the fun of it/my kids or finances Bday. I haven't even thought/been asked to sell a cake. 

@CalaMom ‍ , FYI if you ever want to make a cake with a printed image, most grocery stores that sell cakes and Walmart have edible printers and they will print your image for you.  The price I was quoted at Walmart was $2.00 per sheet, which is not bad.