i found this cool design & my first one always missed solid objects! & here are the instructions:

1.fold in half and unfold

2.fold corner to other end of paper & unfold (do the same with other end.

3.you should have a |X| with a line down the middle-type thing

4.fold X in half @ this point: -X- & push part sticking up part down to make like two triangles

5.on top there should be 2 free corners fold them up but NOT to the middle

6.fold in half but make sure points are still sticking out

7.fold middle tip away from you

8.take a side of the planeto the point that it fits a part of the plane like a puzzle piece (you will know this) & the same with the other end

9.fold in half

10.fold wings down...

                          AND..........

         

     you'r

     done!