Mulling over a project idea and need some advice.

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I want to make a crochet blanket. Specifically an 8 bit Final Fantasy crochet blanket since it would be easier to pattern than other things. I've looked around on sites and whatnot to see how others have done it and have seen a few different styles. Granny squares, solid squares, blended where it's all solid, they just switched out the yarn where needed (have no clue what it's officially called) and a few others. For those that have made crochet blankets:

1) How heavy did your blankets get using a certain style?
2) How much yarn skeins did you use with a certain style?
3) What size hooks did you use with a certain style?

I'd like some input so I can figure out sizing, time to make and cost of materials.