What if there was a painting dimension

So the painting dimension would be entered by making a special shrine and lighting certain parts of the shrine on fire and getting it struck with lightning were the painting is could activate it then you would have to ender pearl in and the painting used would be the creeper painting and inside you would have a very small world just like the painting so like a small old world which looks like the painting and to get out your shrine would spawn there like how the nether works and in that very small dimension there would be a higher chance of creepers spawning so it could be a very good source of gun powder and you could stop them from spawning as you normally would