DIY Kid's Art

I had been looking around for art for the my son's room and I couldn't find anything that was both reasonable and stylish, so I decided to make my own.  I picked up some canvas and oil paints from my local art supply store.  I just roughly sketched out trucks, cars, trains and a tractors and then painted then in shades of grey.  They are not perfect but I think they add a nice detail to the room and my kids loved them.  I framed them with Ikea Ribba Frames in white.