Start arranging the Jenga pieces like this:
If you can see after each pair of Jenga pieces you have to put one piece up beween other two.
Then paste them all together with a very strong glue.
Then paint all the piece with any base color.
After the paint is dry, give it a coat of glue.
After the coat of glue is dry, decorate it as you wish.
To can hang it you can nail an eye screw in the top of a jenga piece and then hang it with a screw or nail.
Also you can nail a screw at the bottom and hold it.