BGRABitmap tutorial

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I'd like to play with this, but the FPC wiki seems to be down.

Yes, unfortunately. You can still have a look at the bgrafunctest folder in LazPaint archive. You can find it here :
http://sourceforge.net/projects/lazpaint/files/src/

I was wondering about a water or ocean type effect on the background of the form or something like that. I think I know what the answer might be though.

Well, it depends. You can precalculate an ocean texture. Then, just showing it is ok. But if you want to animate it, well, it would be too slow, except maybe with a very small texture.