In Books and Islands in Ojibwe Country, Louise Erdrich shares her love of a few contemporary Objibwe artists who are influenced by traditional petroglyphs (see below). I've tracked down some samples of their work online. First, Joe Geschick-- note his book cover art for Erdrich's works. Then there is Blake Debassige. Here is the seasonally appropriate Tree of Life (click on image for a larger version) and another by this artist can be found here. Finally, there is Norval Morriseau. The National Gallery of Canada has a nice selection and Macleod and Kinsman Robinson Galleries have sizable online collections (be sure to hit the arrows to scroll through all). Background on Morrisseau's painting can be found here.