If you would like to try something like I do, sew a rectangular piece of fibre, folded in the middle, along the longer edge. Then fold it in the middle in a perpendicular direction to the first one. You should get a two-plies pipe. Then you can draw a shape you imagine - from squares to oak lieves, on the side which is not open.
Then sew what you've drawn. Don't forget to pin it in advance :-) It can easily get out of control.
When it was finished I cut the fibre about 4 to 5 mm around edges. In sharp places it's necessary to cut even more. Then turn it inside out.
And what the hell is this? It shouln't be the final effect, I just didn't iron the piece yet :-)