Huge blocky text in this generator was made using Blocky text art painting tool that I developed. Try it, it's a lot of fun. If you aren't good at painting in usual ways, you probably still are good at painting text pictures. It's extremely simple and has got a sharp learning curve, so you'll be painting like a pro really really soon after you start.
Unfortunately, the letters are actually so huge that if, say, you want to put generated text in Facebook chat, you'll have to use around 2-3 letters in width max.
You can type English characters A-Z, digits 0-9, and punctuation signs !?=:()"'-,.