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There are lots of other ways to do GPU programming, depending on what kind of computer you have. For Mac, their Metal API is their preferred method, and Windows and Linux have many more options. Of the few GPU programming projects I've done, I have found Nvidia's CUDA language to be the most intuitive; however, you'll need an Nvidia GPU and all the CUDA toolkit and stuff installed (again Google is your friend if you want to try this). I recently made this demo using CUDA. It's mainly written in C++ with one function (the one that computes the color of the pixels) in CUDA (though CUDA is basically C++ with a few simple syntax additions). Here's the source code.
C can still be very challenging, so if you don't really care about performance but just want to have a bit of fun, try Processing. It uses Java and can create some really cool stuff.