Possibly off-topic for this forum (at least for the time being), but here's an amazing demo of what can be achieved with a GPU shader (in roughly 184 lines of code):
I couldn't believe my eyes at first. I thought I was watching a pre-rendered video, but no. All real-time, no textures, purely procedural and somewhat mathematical. The website (shadertoy.com) showcases many excellent GPU shaders.
Exercise for the interested (and clever) BBC BASIC user: port this 'Seascape' shader/demo to BBCSDL
Discussions related to graphics (2D and 3D), animation and games programming
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