I think this is a good idea. What it is is there is one block and it clones itself a lot of times and moves around to make a blocky world. Then when the mouse moves over a block, it will light up. if you click it it will be destroyed. While it is generating, it can change its costume so it looks realistic. There are also air blocks. You can build stuff where there is no block and you can change the block you are using. Then you press the enter button or something like that and your player appears. While your player is on, you can move around and jump and all that.

If you like my idea you can use it but just give some credit to me, cooltooler. I will probably make it too.