So I made my monkey, added a ground plane, and rendered. Then when it finished rendering, it shows this weird final image that I used as a texture before. The first image shows it in the middle of rendering, the second image shows the render result.
The render is being overwritten by something in the compositor or the sequencer. Un-tic "Compositing," and "Sequencer" in the "Post Processing section of the Render settings, and you should see what you expect.
You might also undo whatever sequencing and/or compositing you have going on in those panes.