Now! I'm teaching you how to make cubes! Cubes can be used as boxes or tables or fishtanks or whatever comes in your mind. Someone asked me today(today was 24th August) to help them make 3D objets in FSH editor, so here's the tutorial. I'll try to explain it as well as I can!
1. Draw a diagonal line with the line tool. Make sure that the line is like in that image. Zoom in to see that the pixels are exactly like under the text "YES" and that there are now parts like in the "NO" picture. It has to be EXACTLY like in my image. Trust me in this one.
2. Then you select the line with the selection tool, press control down,drag the image and you should get two of them. From the menu->edit->flip horizontal and then place it like in my image.
3. Then do the same, only select the crossed lines and from the menu->edit->flip vertical and place it like in my image. You should get a square like that.
4. Then you select the whole image, and again, with control pressed down, move the image so, that they're on top of eachother like in the picture 4. Make sure the corners are exactly above eachother.
5. Now! You take the line tool again, and from the corners that will be left visible, you draw a straight line to the corners below. Just like in image 5. They have to be _exactly_ like in my image, make sure they're absolutely straight if you want to make a clean cube.
6. Then, with eraser you remove all lines that shouldn't be there, ending up with a clean cube.
7. Then you color it as you wish to color it, but keep in mind that a big part of "making it look 3D" is to make one side really dark, the other side semidark and the top lightest.
8. You can decorate your cube as you wish, you can draw stars on it, make it a toybox or whatever you want.
And that's it! :) After learning to make a cube like that, maybe try making an aquarium?